Journal of Magnetism and Magnetic Materials最新文献

{"title":"Magnetic and electronic properties of bulk and (111), (001), and (110) surfaces of the Heusler Zr2RhIn alloy","authors":"Hassan I. Asker ,&nbsp;Jabbar M. Khalaf Al-zyadi ,&nbsp;Munira W. Mahan","doi":"10.1016/j.jmmm.2025.173285","DOIUrl":"10.1016/j.jmmm.2025.173285","url":null,"abstract":"<div><div>The electronic and magnetism properties of the bulk as well as (111), (110), and (001) surfaces of Heusler alloy Zr₂RhIn have been studied by using first-principles calculations with (GGA-PBE) method. According to calculations, the compound Zr₂RhIn exhibits full spin polarization and half-metallic ferromagnetic behavior at an equilibrium lattice constant of 6.8 ± 0.01 Å. The energy gap and spin flip gap in the minority channel are 0.47 and 0.11 eV, respectively. The total magnetic moment is 2 ± 0.05 µ_B which agrees with the Slater-Pauling rule. The electronic, magnetism properties and atomic relaxation were examined for the (1<!--> <!-->1<!--> <!-->1), (0<!--> <!-->0<!--> <!-->1), and (1<!--> <!-->1<!--> <!-->0) surfaces of the Zr₂RhIn alloy. The results confirm that the half-metallic property was preserved at Zr1-, Zr2-, and In-terminations (1<!--> <!-->1<!--> <!-->1) surfaces, but disappeared at Rh-terminated (1<!--> <!-->1<!--> <!-->1) surface due to the surface states, likewise disappeared at (0<!--> <!-->0<!--> <!-->1) and (1<!--> <!-->1<!--> <!-->0) surfaces. These findings highlight the sensitivity of half-metallicity to surface orientation and termination, making Zr₂RhIn a promising candidate for spintronic devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173285"},"PeriodicalIF":2.5,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263304","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":"Design of audio to image cross-modal learning and generation based on single-layer CoPt spin-orbit torque devices","authors":"Likun Qian ,&nbsp;Liu Yang ,&nbsp;Chao Zuo ,&nbsp;Ying Tao ,&nbsp;Wendi Li ,&nbsp;Fang Jin ,&nbsp;Huihui Li ,&nbsp;Kaifeng Dong","doi":"10.1016/j.jmmm.2025.173279","DOIUrl":"10.1016/j.jmmm.2025.173279","url":null,"abstract":"<div><div>Despite remarkable achievements in neural network applications using spin–orbit torque (SOT) devices, current research predominantly focuses on unimodal classification tasks, while cross-modal learning tasks often suffer from suboptimal generation quality. To address this limitation, we employ generative adversarial networks (GANs) based on CoPt-SOT to achieve cross-modal learning and generation from speech to handwritten digit images. Initially, we explore the field-free switching characteristics of single-layer CoPt devices, developing spin-based implementations of Scaled Rectified Linear Unit (SReLu), Sigmoid, and Tanh neuronal functions. Simultaneously, we leverage the nonvolatile multistate characteristics of CoPt devices to realize excitatory-inhibitory synaptic plasticity. Subsequently, for the first time, we construct half-spin and full-spin GAN networks using these spin-based neurons and synapses, enabling cross-modal learning and generation between speech and image domains. Finally, we evaluate the performance of these networks through handwritten digit recognition tasks, achieving impressive recognition accuracies of 93.78 % and 88.61 % for half-spin and full-spin implementations, respectively. Notably, this work overcomes the existing bottleneck in SOT device applications, which have been largely confined to unimodal classification tasks, and demonstrates significant potential for expanding the scope of SOT-based technologies.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173279"},"PeriodicalIF":2.5,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240163","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":"Design and performance analysis of magnetic helical robot used for vascular interventions","authors":"Pan Li ,&nbsp;Chongcong Ye ,&nbsp;Zhichao Wang ,&nbsp;Jiarui Zhang ,&nbsp;Qi Xue ,&nbsp;Delei Fang ,&nbsp;Junxia Zhang ,&nbsp;Cunman Liang","doi":"10.1016/j.jmmm.2025.173267","DOIUrl":"10.1016/j.jmmm.2025.173267","url":null,"abstract":"<div><div>During minimally invasive vascular interventions, the maneuverability of guidewires is usually limited by narrow blood vessels. In this study, we designed a magnetic helical robot capable of overcoming spatial constraints within narrow blood vessels and precisely navigating guidewires to target regions. The structure of the magnetic helical robot consists of a front-end permanent magnet and helical structure, a flexible body structure, and a trailing guidewire. By considering resistance theory in low Reynolds number environments, we developed a dynamic model for the magnetic helical robot and analyzed the relationship between its motion velocity and helical structure parameters. Based on a guidewire deflection cantilever model, we investigated the relationship between guidewire deflections and flexible body structure parameters. Dynamic experiments were conducted on the magnetic helical robot to verify its active locomotion capability and confirm the optimal helical structure parameters. Additionally, guidewire deflection experiments demonstrated that increasing the length of the flexible body structure resulted in a maximum bending gain of up to 30 %, confirming the enhanced deformability of the carried guidewire and determining the optimal length of the flexible body structure. Furthermore, successful navigation experiments of the magnetic helical robot carrying a guidewire were performed in a three-dimensional vascular model, with a navigation error of 0.80 mm, thereby validating the locomotion and capability of enhancing guidewire deflections of the magnetic helical robot. The designed magnetic helical robot in this study provides experimental evidence for minimally invasive vascular interventions and holds promise for application in vascular intervention procedures.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173267"},"PeriodicalIF":2.5,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270432","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":"Exploring the three-field coupling mechanism of temperature-magnetic stress relief in electrical metal materials","authors":"Gang Huang,&nbsp;Chao Zhou","doi":"10.1016/j.jmmm.2025.173278","DOIUrl":"10.1016/j.jmmm.2025.173278","url":null,"abstract":"<div><div>This paper presents a comparative investigation into the efficacy of temperature-magnetic stress relief (TMSR) applied to silicon steel, along with an analysis of the ensuing microstructural changes post-TMSR treatment. The findings reveal that TMSR exhibits a remarkable “1 + 1 &gt; 2″ reduction effect. Following TMSR treatment, there is a notable increase in dislocations within the material, accompanied by a rise in parallel domains that are uniformly distributed. Furthermore, density functional theory simulations were conducted on Fe crystals subjected to varying temperature fields to examine changes in crystal properties and elucidate the mechanism behind TMSR’s reduction and enhancement effects. The simulation outcomes indicate a consistent upward trend in crystal atomic magnetic moment with increasing temperature, regardless of stress levels, suggesting a pronounced thermos-magnetic coupling strengthening effect. This phenomenon constitutes the primary mechanism driving the attenuation and enhancement effects observed with TMSR. Additionally, systematic calculations were performed to assess the mechanical properties of the crystal under different temperature conditions. The results demonstrate a continuous softening of the crystal with increasing temperature, eventually leading to a phase change upon surpassing a critical temperature threshold.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173278"},"PeriodicalIF":2.5,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240161","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":"Effect of pressure on the structural, magnetic, dynamical and mechanical properties of α″-Fe16N2","authors":"Tai-min Cheng,&nbsp;Guo-qing chai,&nbsp;Qing-qing Fan,&nbsp;Guo-liang Yu,&nbsp;Xin-xin Zhang","doi":"10.1016/j.jmmm.2025.173277","DOIUrl":"10.1016/j.jmmm.2025.173277","url":null,"abstract":"<div><div>The ground-state properties of the <em>α</em>″-Fe₁₆N₂ compound have been thoroughly studied, while its physical properties under high pressure are unknown. Here, the effect of pressure on the structural, electronic, magnetic, mechanical and dynamical properties of the <em>α</em>″-Fe₁₆N₂ are systematically investigated from the first principles calculations. The theoretical results at 0 GPa are consistent with previous theoretical and experimental values. The critical pressure of ferromagnetic collapse (<em>P</em>_C) is about 61.2 GPa. The magnetic moments of the Fe atoms at 4d and 4e sites are the largest and smallest, respectively. The Fe moments are mainly derived from the spin polarization of the <em>d_z</em>² and <em>d_x</em>²_-<em>_y</em>² electrons. From the phonon spectra, the <em>α</em>″-Fe₁₆N₂ exhibits the dynamic stability below the <em>P</em>_C, and the Fe atoms at the three sites show different vibrational anisotropy under high pressure. According to the <em>B</em>/<em>G</em> and Poisson’s ratios, the Fe₁₆N₂ exhibits excellent metallic ductility below the <em>P</em>_C. The elastic modulus increases with pressure, but softens near the critical pressure. In addition, the elastic anisotropy also mutates near the critical pressure <em>P</em>_C.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173277"},"PeriodicalIF":2.5,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253698","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":"Microfluidic-integrated SSPP sensor for rapid and sensitive label-free honey adulteration","authors":"Shaik Imamvali ,&nbsp;Rishitej Chaparala ,&nbsp;Yuvaraju Chinnam ,&nbsp;Venkateswara Rao Kolli ,&nbsp;Sreenivasulu Tupakula ,&nbsp;Krishna Prakash ,&nbsp;Shonak Bansal ,&nbsp;Mohammad Rashed Iqbal Faruque ,&nbsp;K.S. Al-mugren","doi":"10.1016/j.jmmm.2025.173255","DOIUrl":"10.1016/j.jmmm.2025.173255","url":null,"abstract":"<div><div>A Spoof surface plasmon polariton (SSPP) sensor is developed to identify honey samples by adding different concentrations levels of sugar (glucose and fructose). The SSPP-based sensor is integrated with a microfluidic reservoir to discriminate honey samples. The change in the resonating frequency shift with changed percentages of fructose and glucose levels of honey samples shows the performance of the SSPP sensor. This innovative approach presents a non-destructive, non-intrusive, label-free, rapid, and real-time methodology for analysing honey samples. The sensor exhibits exceptional sensitivity in detecting subtle differences in the dielectric constants of diverse samples. We systematically investigate the impact of distinct geometrical parameters on the sensor’s performance, focusing on optimizing its characteristics. A distinctive pentagon-shaped unit cell (UC) for the SSPP construction is thoroughly explored, revealing its unique performance and sensing capabilities. We construct a multilayer SSPP microwave structure with a pentagon unit cell to create a functional sensing platform for honey samples. The transient solver is used for computational analysis. Our results indicate a remarkable sensitivity of 1522 MHz/epsilon unit, with a correlation coefficient (R²) of 0.9367, for discerning between different dielectric samples ranging from 1 to 5 for normal pentagon unit cells. Additionally, for vertex-based pentagon unit cells, the sensor demonstrates a sensitivity of 1105 MHz/epsilon unit, with an R² of 0.9524, when applied dielectric constants within the range of 1–5. These simulation outcomes highlight the viability of the suggested SSPP-inspired sensor as a promising solution for monitoring applied dielectric quality and characterizing the honey sample’s dielectric constants. This integrated approach showcases the potential to revolutionize quality assessment within the realm of honey production and diverse materials through its advanced sensing capabilities.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173255"},"PeriodicalIF":2.5,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263260","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":"Study on quantitative characterization of yield state for locally corroded bridge steel via metal magnetic memory method","authors":"Yiyi Yang ,&nbsp;Xiaoping Ma","doi":"10.1016/j.jmmm.2025.173271","DOIUrl":"10.1016/j.jmmm.2025.173271","url":null,"abstract":"<div><div>Corrosion poses a significant threat to the load-bearing capacity of steel components in bridges. Metal Magnetic Memory (MMM) emerges as a promising technique for detecting corrosion-induced damage. In this paper, the tensile tests for 18 Q345qD specimens with local corrosion were performed and the SMFL signals <em>H</em>_SF(<em>y</em>) on all specimens were measured. The results show that as the tensile load increased, the mutation degree of the <em>H</em>_SF(<em>y</em>) signal in the corroded region increased monotonically before yielding and decreased monotonically after yielding. The difference <em>H</em>_SF(<em>y</em>)_m between the maximum and minimum of <em>H</em>_SF(<em>y</em>) signals, as a magnetic characteristic parameter, showed a maximum at the yield load, which had a potential possibility for the judgment of the yield status for the locally corroded bridge steel. Furthermore, the modified elastoplastic magneto-mechanical coupling model and the magnetization-related 3-D magnetic charge model were proposed to further describe the quantitative relationship between the magnetic characteristic parameter and tensile load for the corroded bridge steel. The theoretical curve agreed well with the experimental data, and the characterization error of yield loads for corroded specimens based on the maximum theoretical magnetic characteristic parameter averaged 2.21%. This demonstrated that the established theoretical calculation models can accurately reflect the yield load of corroded specimens. This research serves as a base for the yield state characterization for corroded bridge members via the MMM.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173271"},"PeriodicalIF":2.5,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263303","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":"Experimental and theoretical study of room temperature Heusler ferrimagnets: CuMnCrAl, NiFeCrAl, Ni0.5Fe1.5CrAl; An aliovalent analogs of the Co2CrAl compound","authors":"Jerzy Goraus ,&nbsp;Wojciech Gumulak ,&nbsp;Mariola Ka̧dziołka-Gaweł ,&nbsp;Ondrej Zivotsky ,&nbsp;Joanna Klimontko ,&nbsp;Oliwia Starczewska","doi":"10.1016/j.jmmm.2025.173218","DOIUrl":"10.1016/j.jmmm.2025.173218","url":null,"abstract":"<div><div>Some Heusler compounds, particularly Co<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>CrAl, have been extensively studied due to their potential spintronic applications related to their half-metallic ferromagnet (HMF) properties, as well as magnetic ordering near room temperature. Here, we report aliovalent analogs to that compound, where we replaced expensive and problematic cobalt with its neighboring elements in the periodic table, in a way that we conserved the number of valence electrons. These compounds were not studied experimentally before. Our XRD measurements show that they crystallize in the Heusler structure, whereas our magnetization measurements show that CuMnCrAl, NiFeCrAl, Ni_0.5Fe_1.5CrAl have higher magnetic ordering temperatures than Co<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>CrAl — 354 K, 541 K, and 465 K, respectively.</div><div>We also present data for Cu_0.5Mn_0.5Ni_0.5Fe_0.5CrAl which is magnetic too, but at lower temperatures. Susceptibility measurements at higher temperatures show that the magnetic order is ferrimagnetic, with some magnetic sublattices antiparallel to others. It is also confirmed by comparison of our DFT calculations with Mössbauer spectroscopy investigations and magnetization data. In our ab initio calculations, we also compare the three structural models possible for XX’YZ quaternary Heusler structure with Mössbauer and magnetization data, and conclude whether previously claimed HMF state in NiFeCrAl is possible. We also have shown that for completely disordered structure (alloy) the magnetic moments are preserved, and they are higher than experimentally observed.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173218"},"PeriodicalIF":2.5,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253705","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":"d9 multiferroics: From copper oxide high-temperature superconductors to ferroelectrics","authors":"RuiFeng Zhang,&nbsp;Hu Zhang","doi":"10.1016/j.jmmm.2025.173274","DOIUrl":"10.1016/j.jmmm.2025.173274","url":null,"abstract":"<div><div>Multiferroics are materials with a coexistence of magnetic and ferroelectric order allowing the manipulation of magnetism by applications of an electric field through magnetoelectric coupling effects. Here we propose an idea to design a class of multiferroics with a d⁹ configuration using the magnetic order in copper-oxygen layers appearing in parent compounds of copper oxide high-temperature superconductors by inducing ferroelectricity. Copper-based charge transfer multiferroics SnCuO₂ and PbCuO₂ having the inversion symmetry breaking <em>P</em>4<em>mm</em> polar space group are predicted to be such materials. The buckling in the copper-oxygen layers induces ferroelectricity. As a result of the d⁹ configuration, SnCuO₂ and PbCuO₂ are charge transfer insulators with the antiferromagnetic ground state of the moment on Cu. Our work reveals the possibility of designing d⁹ multiferroics based on electronic structures of parent compounds of copper oxide high-temperature superconductors.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173274"},"PeriodicalIF":2.5,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240147","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":"Temperature dependent variation of magnetic properties of SmFeO3 ceramic","authors":"S.K. Das ,&nbsp;Dipti R. Sahu ,&nbsp;Sasmita Otta","doi":"10.1016/j.jmmm.2025.173270","DOIUrl":"10.1016/j.jmmm.2025.173270","url":null,"abstract":"<div><div>SmFeO₃ will be a potential material for futuristic device applications by tailoring its magnetic and polar order parameters. In this report, the magnetic order of the SmFeO₃ ceramic sample is probed by systematic temperature dependent variation of magnetization under different magnetic fields from low temperature to 350 K. An interesting phenomenon is observed in field cooled (FC)<em>,</em> and zero fields cooled (ZFC) modes. <em>Temperature variation of magnetization in FC and ZFC mode shows</em> reversal of magnetization, and a crossover temperature is reached at 3.8 K under magnetic field 10 kOe. The onset of various magnetic contributions from both Fe and Sm sublattices exhibits magnetic and <em>polar orders in samarium ferrites.</em></div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173270"},"PeriodicalIF":2.5,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240165","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}