Journal of Magnetism and Magnetic Materials最新文献

{"title":"Tunable magnetoelectric antennas enabled by multi-physics synergistic regulation","authors":"Sijie Min,&nbsp;Kai Liu,&nbsp;Na Li,&nbsp;Zeshuo Jiao,&nbsp;Yiqun Zhang,&nbsp;Bin Zheng","doi":"10.1016/j.jmmm.2026.173831","DOIUrl":"10.1016/j.jmmm.2026.173831","url":null,"abstract":"<div><div>The demand for highly miniaturized antennas in micro-unmanned platforms has motivated the exploration of magnetoelectric (ME) antennas, which achieve sound-electric-magnetic energy conversion through the strong coupling between piezoelectric and magnetostrictive layers. Although ME antennas offer extreme size reduction by leveraging bulk acoustic wave resonance, their performance remains limited due to incomplete understanding of multi-physics coupling mechanisms under practical environmental disturbances. In this work, a unified multiphysics model is established based on the constitutive equations of piezoelectric and magnetostrictive materials. Analytical expressions for the inverse magnetoelectric coefficient and acoustic resonance frequency are derived as functions of external stress, magnetic field, and temperature. Simulation results show that moderate stress and bias magnetic field enhance ME coupling efficiency, whereas temperature mainly induces linear frequency drift. Under the parameter-scan ranges and evaluation criteria defined in this work, the recommended combined condition for subsequent tuning-scheme validation is 20 MPa stress, 4000 A/m magnetic field, and 20 °C. Based on these findings, three frequency-tuning approaches DC-voltage tuning, capacitive loading, and integration of a phase-change material layer are further proposed, enabling controllable and wide-range frequency adjustment. The results provide quantitative guidelines for ME antenna design under complex environments and demonstrate clear potential for applications in micro-unmanned platforms and other constrained multiphysics scenarios.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173831"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic property study of cryogenic permalloy for magnetic shielding in SHINE","authors":"Yongzhou He,&nbsp;Jian Dong","doi":"10.1016/j.jmmm.2026.173836","DOIUrl":"10.1016/j.jmmm.2026.173836","url":null,"abstract":"<div><div>Cryogenic permalloy serves as the essential soft magnetic material for magnetic shielding of superconducting radio-frequency (SRF) cavities used in the cryomodules of advanced synchrotron radiation sources and hard X-ray free-electron lasers. Conventional permalloys exhibit severe degradation of permeability in liquid-nitrogen (LN₂) and sub-LN₂ environments, making them unsuitable for the increasingly stringent ultra-low-field requirements of SRF cavities. This work presents the design, fabrication, and systematic characterization of several composition-engineered permalloy variants developed specifically for magnetic shielding in the Shanghai High repetition-rate XFEL and Extreme light facility (SHINE) superconducting modules. Comprehensive magnetometric analyses demonstrate that the newly developed cryogenic permalloys maintain excellent soft-magnetic properties at both room temperature and 77 K, while also exhibiting a broad heat-treatment window and outstanding corrosion resistance. At LN₂ temperature, the initial permeability <span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>i</mi></mrow></msub></math></span> reaches 4 <span><math><mo>×</mo></math></span> 10⁵–1 <span><math><mo>×</mo></math></span> 10⁶ and the maximum permeability <span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span> reaches 3 <span><math><mo>×</mo></math></span> 10⁶–4 <span><math><mo>×</mo></math></span> 10⁶—values that significantly surpass those of both conventional permalloys and existing cryogenic permalloys—thus fully meeting the demanding shielding-efficiency requirements of SHINE and similar SRF cavity systems.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173836"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Twist-tunable moiré magneto-Excitonic Polaritons at 2D ferromagnetic interfaces","authors":"Arash Vaghef-Koodehi ,&nbsp;Mahmoud Nikoufard ,&nbsp;Yaser Bahari","doi":"10.1016/j.jmmm.2026.173812","DOIUrl":"10.1016/j.jmmm.2026.173812","url":null,"abstract":"<div><div>We present a theoretical investigation of moiré magneto-excitonic polaritons in twisted bilayer transition-metal dichalcogenide heterostructures interfaced with two-dimensional ferromagnets. By combining a full electromagnetic simulation based on time-domain finite-difference (FDTD) calculations with a microscopic exciton–magnon Hamiltonian derived from tight-binding theory, we reveal the emergence of strong hybridization between excitonic and magnonic modes mediated by the moiré superlattice potential. The coupling strength exhibits Rabi splitting up to ≈ 8 meV under moderate magnetic fields and maintains coherent hybridization up to 180 K for CrI₃ and 230 K for Fe₃GeTe₂ substrates. The hybrid mode shows pronounced valley-selective behavior with an intensity ratio of ∼8:1 (K:K′) and an ultrafast oscillation period in the terahertz (THz) range, corresponding to light–matter–spin coherence on the picosecond scale. These results uncover a controllable pathway to engineer moiré-assisted exciton–magnon coupling governed by twist angle, magnetic exchange, and gate bias, thereby providing a physical foundation for tunable spin-polarized quantum photonic and opto-magnonic devices. Beyond its fundamental implications for correlated moiré physics, this study delineates a realistic route toward THz-bandwidth, nonreciprocal, and valley-selective photonic interfaces operating at elevated temperatures—establishing moiré magneto-excitonics as a credible frontier for next-generation hybrid quantum materials.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173812"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural evolution during aging process in 2:17-type SmCo sintered magnets with different iron content","authors":"Shuai Wang ,&nbsp;Chenchen Xu ,&nbsp;Weixiao Hou ,&nbsp;Hui Yong ,&nbsp;Yu Wang ,&nbsp;Jifan Hu","doi":"10.1016/j.jmmm.2026.173870","DOIUrl":"10.1016/j.jmmm.2026.173870","url":null,"abstract":"<div><div>It is confirmed that the aging process to obtain excellent magnetic properties is different for the magnets with various Fe content, and the influence of isothermal aging duration and cooling rate on microstructure and magnetic properties of the magnets has been studied systematically. As the isothermal aging duration increases, the <em>B</em>_r of magnets with different Fe content decreases due to the increasing 1:5H phase. The isothermal aging duration is 4 h for the Sm(Co_balFe_0.227Cu_0.072Zr_0.023)_7.6 magnet (Magnet A, relatively low Fe content) to obtain optimal <em>H</em>_cj and <em>H</em>_k, which is shorter than that of the Sm(Co_balFe_0.263Cu_0.072Zr_0.023)_7.6 magnet (Magnet B): 8 h. The magnets that have undergone appropriate aged time exhibit complete cellular structure, high lamellar phase density and high Cu concentration at cell boundaries, which makes the magnets show high <em>H</em>_cj and <em>H</em>_k. It is also found that the magnet with lower Fe content exhibits a faster ordering transformation rate during the aging process. On the other hand, the optimal aging cooling rate required to achieve desirable magnetic properties varies with the Fe content in the magnets. At a cooling rate of 1.5 K/min, Magnet B with higher Fe content still maintains a high and homogeneous distribution of the peak Cu concentration at the cell boundaries, resulting in excellent magnetic properties. In contrast, a lower peak Cu concentration was observed in some cell boundaries of Magnet A under the same conditions, leading to the reduction of <em>H</em>_cj and <em>H</em>_k.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173870"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic carbon-nanoparticles behavior of biomorphic pyrolytic carbons","authors":"V.V. Popov ,&nbsp;T.S. Orlova ,&nbsp;A.A. Spitsyn ,&nbsp;D.A. Kirilenko ,&nbsp;K.V. Dyakonov","doi":"10.1016/j.jmmm.2026.173811","DOIUrl":"10.1016/j.jmmm.2026.173811","url":null,"abstract":"<div><div>Magnetic properties of biomorphic carbon-based materials obtained from birch-wood pyrolysis products using carbonization temperature of 700 °C with and without subsequent activation at 970 °C have been studied in a wide temperature range of 2–300 K in magnetic fields up to 140 kOe. It was found that biocarbon samples purified from volatile wood decomposition product (tar) during pyrolysis demonstrate diamagnetic behavior of magnetization at room temperature and paramagnetic at low temperatures, while in biocarbon samples with residual or specially introduced pyrolysis tar, a ferromagnetic component of magnetization is observed at room temperature. The analysis showed that ferromagnetism appears as a result of the formation of carbon magnetic nanoparticles during the carbonization of binding tar in the biocarbon. The magnitude of magnetization of such nanoparticles is comparable to the magnetization of nanoparticles formed by ferromagnetic metals that opens way to obtain porous magnetic biocarbon materials without ferromagnetic metal inclusions.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"640 ","pages":"Article 173811"},"PeriodicalIF":3.0,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase stability and tunable structural, hyperfine, and magnetic properties of Sol–Gel FeNi nanoparticles","authors":"M.A.R. Martinez ,&nbsp;F.F.H. Aragón ,&nbsp;L. León Félix ,&nbsp;J. Mantilla ,&nbsp;M.H. Sousa ,&nbsp;M.C. Mathpal ,&nbsp;J.F. Felix ,&nbsp;J.A.H. Coaquira","doi":"10.1016/j.jmmm.2025.173792","DOIUrl":"10.1016/j.jmmm.2025.173792","url":null,"abstract":"<div><div>In this study, <span><math><mo>∼</mo></math></span>Fe₅₀Ni₅₀ powder alloys were synthesized successfully using the sol–gel method, followed by systematic thermal treatments up to 1000 °C in a reducing atmosphere (Ar-H<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>). Synchrotron X-ray diffraction patterns indicate that the data are well modeled by face-centered cubic (FCC) FeNi phase. The stability of this phase was studied, revealing that as the temperature is increased, the unit cell volume changes, suggesting an enhancement in the migration of iron atoms. This migration alters the stoichiometry of the FeNi alloy, potentially shifting it beyond its nominal 50/50 composition. High-resolution TEM demonstrated the formation of the FeNi phase, which is in good agreement with the results obtained by XRD. Additionally, only a slight increase in crystalline particle size was observed. Magnetic characterization shows that thermal annealing strongly influences the magnetization. In particular, the sample annealed at 700 °C exhibits the highest magnetization and a Curie temperature <span><math><mo>∼</mo></math></span>805 K, highlighting the role of thermal treatments in tuning the magnetic response. Zero-field cooling and field cooling measurements in the range 5–380 K further reveal irreversibilities above room temperature, attributed to the small particle size and strong interparticle interactions, which significantly affect the coercive field and overall magnetic behavior. These FeNi nanoparticles were characterized as magnetically soft materials. Mössbauer spectroscopy confirms the ferromagnetic behavior of the cubic FeNi phase as shown by XRD. Increasing the treatment temperature produces an increase in the hyperfine magnetic field, while the IS becomes more negative, which is primarily attributed to modifications in the s-electron density at the iron nuclei resulting from thermally induced electronic redistribution.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"640 ","pages":"Article 173792"},"PeriodicalIF":3.0,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alloying effect on the magnetic and magnonic properties of a thin-film superlattice based on the magnetic semiconductor Ge1−xFex/Ge","authors":"Marouan Karam,&nbsp;Atika Fahmi,&nbsp;Ahmed Qachaou,&nbsp;Mounir Fahoume,&nbsp;Ismail Benaicha,&nbsp;Jaouad Mhalla,&nbsp;Abderrahim Raidou,&nbsp;Mohamed Lharch","doi":"10.1016/j.jmmm.2025.173787","DOIUrl":"10.1016/j.jmmm.2025.173787","url":null,"abstract":"<div><div>In this work, we investigate the effect of alloying on the magnetic properties of the semiconductor ferromagnetic Ge<span><math><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></math></span>Fe<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span>/Ge(001) superlattice. The system Hamiltonian is described within the localized-spin Heisenberg model. The excitation spectrum is calculated using linear spin-wave theory. A quantitative analysis of the experimental magnetization data reveals the existence of a spin reorientation transition (SRT) at the inflection temperature (<span><math><mrow><mi>T</mi><mo>=</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>r</mi></mrow></msub></mrow></math></span>). To explain the behavior of this magnetization, we have developed a theoretical model based on the presence of a mixture of two magnon populations: quantum magnons and classical magnons. Furthermore, the agreement between the calculated and experimental magnetization curves is very satisfactory, enabling the determination of the key magnetic parameters of the system, namely, <span><math><mrow><msub><mrow><mi>J</mi></mrow><mrow><mo>∥</mo></mrow></msub><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow></mrow></math></span>, <span><math><mrow><msub><mrow><mi>J</mi></mrow><mrow><mo>⊥</mo></mrow></msub><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow></mrow></math></span>, <span><math><mrow><mi>Δ</mi><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow></mrow></math></span>, and <span><math><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>r</mi></mrow></msub><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow></mrow></math></span>.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"640 ","pages":"Article 173787"},"PeriodicalIF":3.0,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of magnetic phase transition and critical behavior in Cu2OSeO3 via magnetocaloric effect","authors":"Sudipta Mahana ,&nbsp;Prasanta Kumar Behera ,&nbsp;Keshab Chandra Prusty ,&nbsp;Pronoy Nandi ,&nbsp;Dinesh Topwal","doi":"10.1016/j.jmmm.2025.173791","DOIUrl":"10.1016/j.jmmm.2025.173791","url":null,"abstract":"<div><div>Polycrystalline Cu₂OSeO₃ was synthesized via a solid-state reaction method, and its phase purity was confirmed through X-ray diffraction followed by Rietveld refinement. The compound features two distinct crystallographic copper sites: Cu(I) in a trigonal bipyramidal configuration and Cu(II) in a square pyramidal arrangement, present in a 1:3 ratio. This unique structure leads to complex magnetic interactions between the sites. Magnetic properties were investigated using DC magnetization and AC susceptibility measurements. The material exhibits a delicate balance of symmetric superexchange interactions, antisymmetric Dzyaloshinskii-Moriya (DM) interaction, magnetocrystalline anisotropy, and Zeeman energy, resulting in various intricate magnetic phases. These include fluctuation disorder (FD), helical, skyrmion mixed conical and tilted spiral, conical, field-polarized ferrimagnetism, and importantly, the skyrmion phase. Additionally, the magnetocaloric effect was studied through temperature-dependent heat capacity measurements under different magnetic fields. The findings indicate reasonable magnetic refrigeration capabilities, with maximum magnetic entropy changes of 2.23 J/kg·K and 4.25 J/kg·K at around 60 K for field changes of 4 T and 7 T, respectively. The corresponding maximum relative cooling powers are determined to be 67 J/Kg and 140 J/kg. The critical correlation was also investigated through the magnetocaloric effect, demonstrating 3D Heisenberg interaction above the paramagnetic to FD transition temperature (<em>T</em>_<em>c</em>), accompanied by short-range magnetic correlations. Furthermore, the universal behavior of the normalized magnetic entropy-change curve confirms the presence of a second-order magnetic phase transition near <em>T</em>_<em>c</em> under high magnetic fields.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"640 ","pages":"Article 173791"},"PeriodicalIF":3.0,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing Nd–Ce–Fe–B grain boundary structure by Pr–Nd–Cu–Ga prealloyed powder to enhance coercivity","authors":"Zikai Wu ,&nbsp;Hongsheng Chen ,&nbsp;Zhongge Luo ,&nbsp;Chen Wang ,&nbsp;Jiayi He ,&nbsp;Kuangxin Luo ,&nbsp;Haojun Zhou ,&nbsp;Fenghua Luo","doi":"10.1016/j.jmmm.2025.173790","DOIUrl":"10.1016/j.jmmm.2025.173790","url":null,"abstract":"<div><div>Cerium (Ce) is a high-quality substitute for Pr/Nd in Nd–Fe–B magnets due to its low cost and abundant natural reserves. However, the coercivity (H_cj) of Re–Fe–B magnets with high Ce content is difficult to improve due to the aggregation of ReFe₂ phase at the triple junctions. This study investigated the grain boundary reconstruction in Nd-Ce-Fe-B sintered magnets using Pr–Nd–Cu–Ga prealloyed powder. The results indicate that as the addition amount of Pr–Nd–Cu–Ga increases, H_cj gradually increases. When the addition amount is 4 wt%, the maximum H_cj of the obtained magnet at a remanence of 11.5 kGs is 14.8 kOe. Grain boundary reconstruction promotes the continuous formation of ReFe₂ and other rare earth rich phases at grain boundaries, promoting the forming of thicker grain boundary layers and improving magnetic isolation. Furthermore, Pr–Nd–Cu–Ga leads to an increase in ReFe₂ phase; Cu and Ga can enhance the stability of ReFe₂ phase, while Nd partially replaces Ce in the grain boundary ReFe₂ phase, forming a new Nd–dominated 1:2 phase that enhances magnet wettability. The results advance the understanding of the ReFe₂ phase and provide critical insights for developing low–cost Nd–Ce–Fe–B magnets with high H_cj.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"640 ","pages":"Article 173790"},"PeriodicalIF":3.0,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Piezoelectric strain influenced modulation of magnetic domain wall motion in hybrid PMN-PT (011)/CoFeB heterostructures with perpendicular magnetic anisotropy","authors":"S. Roy ,&nbsp;A. Solignac ,&nbsp;N. Montblanc ,&nbsp;T. Maroutian ,&nbsp;A. Di Pietro ,&nbsp;D. Ravelosona ,&nbsp;G. Durin ,&nbsp;L. Herrera Diez ,&nbsp;G. Agnus","doi":"10.1016/j.jmmm.2025.173796","DOIUrl":"10.1016/j.jmmm.2025.173796","url":null,"abstract":"<div><div>This study investigates how piezoelectric strain influences magnetic domain-wall (DW) motion in perpendicularly magnetized Ta/CoFeB/MgO ultrathin films grown on PMN-PT (011) substrates. Applying a gate voltage along the out-of-plane direction of the PMN-PT (011) substrate induces a non-volatile electrical polarization, producing a stable strain state (the poled state), which was confirmed using piezoresponse force microscopy. In this configuration, polar magneto-optical Kerr effect (P-MOKE) measurements reveal that this voltage-controlled remanent strain in the PMN-PT substrate can modulate DW dynamics and magnetic properties relative to the unpoled (as-grown) state. This response can be linked not only to a strain-controlled magnetic anisotropy but also to a strain-controlled change in the homogeneity of the magnetic landscape. The multiple polarization directions of the domains in the unpoled state of the PMN-PT can result in a wider anisotropy distribution in the magnetic system compared to the poled state. This can significantly affect DW nucleation/depinning fields, highlighting the role of piezoelectric strain in controlling DW dynamics. These results are of interest for the development of DW based magnetic memory applications with a reduced energy consumption.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"640 ","pages":"Article 173796"},"PeriodicalIF":3.0,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}