Journal of Superconductivity and Novel Magnetism最新文献

{"title":"Compressive Evaluation of Structural, Electronic, Elastic, and Magnetic Features of Ni2XAl (X = V, Fe) Heusler Alloys: A DFT Insight","authors":"Baghdad Sehoul,&nbsp;Tanmayee Das,&nbsp;Ashim Dutta,&nbsp;Tahani I. Al-Muhimeed,&nbsp;Syed Haseeb Ali Ahmad","doi":"10.1007/s10948-024-06854-y","DOIUrl":"10.1007/s10948-024-06854-y","url":null,"abstract":"<div><p>The physical properties of Ni₂XAl (X = V, Fe) alloys were investigated using the full-potential linearized augmented plane wave (FP-LAPW) method based on density functional theory (DFT), employing the Wien2K code. The generalized gradient approximation (GGA) was applied for the exchange and correlation potential (XC) during structural optimization. The elastic analysis indicates that both Ni₂VAl and Ni₂FeAl alloys are mechanically stable. Ni₂FeAl is a spin-magnetic alloy that crystallizes in a stable cubic structure, while Ni₂VAl is a non-magnetic alloy with a stable L2₁ cubic structure. Our study reveals that Ni₂VAl exhibits metallic characteristics in its electronic properties, and similarly, Ni₂FeAl demonstrates metallic behavior in both spin-up and spin-down states. Regarding magnetism, Ni₂VAl is non-magnetic, in contrast to the magnetic Ni₂FeAl. These findings suggest that Ni₂XAl (X = V, Fe) alloys are promising candidates for future applications in spintronics.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142811088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: Reply to “Evidence of Superconductivity in Electrical Resistance Measurements of Hydrides Under High Pressure” by Balakirev et al.","authors":"J. E. Hirsch","doi":"10.1007/s10948-024-06834-2","DOIUrl":"10.1007/s10948-024-06834-2","url":null,"abstract":"","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 11-12","pages":"1783 - 1783"},"PeriodicalIF":1.6,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reply to “Evidence of Superconductivity in Electrical Resistance Measurements of Hydrides Under High Pressure” by Balakirev et al.","authors":"J. E. Hirsch","doi":"10.1007/s10948-024-06833-3","DOIUrl":"10.1007/s10948-024-06833-3","url":null,"abstract":"<div><p>In their Comment [1], Balakirev et al claim that our paper Ref. [2] that proposed an alternative explanation for resistance drops observed in many hydrides under pressure as the temperature is lowered interpreted as evidence for superconductivity, overlooked previously published experimental results that directly contradict its claims. Here we address the issues raised.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 11-12","pages":"1785 - 1791"},"PeriodicalIF":1.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Low Iron Doping on the Structural, Optical, and Magnetic Properties of Zinc Oxide Nanofilms for Spintronic Applications","authors":"Gharam A. Alharshan,&nbsp;S. Hassaballa,&nbsp;M. A. M. Uosif,&nbsp;E. R. Shaaban,&nbsp;Mohamed N. Abd-el Salam","doi":"10.1007/s10948-024-06826-2","DOIUrl":"10.1007/s10948-024-06826-2","url":null,"abstract":"<div><p>Films with varying compositions of Zn_1-xFe_xO (0 ≤ <i>x</i> ≤ 0.10) were produced using the sol–gel technique. The structural, optical, and magnetic studies were examined via “X-ray diffraction,” “EDX,” “UV–Vis spectrophotometer,” and “vibrating magnetometer.” The X-ray analysis data shows that all the films under examination have a hexagonal polycrystalline structure. As well, the crystallite size, <i>D</i>, reduced from 16.7 to 12.5 nm as the Fe ratio rose. The current findings show that the band gap, <i>E</i>_<i>g</i>^<i>opt</i>, is decreasing from 3.389 to 3.036 eV, suggesting the sp-d exchange that occurs between the s-p electrons of the valence and conduction bands and the d-electrons associated with the doped Fe³⁺ ions. Additionally, the refractive index, <i>n</i>, extinction coefficient, <i>k</i>_<i>ex</i>, and coefficient of Verdet, <i>Vλ</i>, as well the sheet resistance, <i>R</i>_<i>s</i>, and the figure of merit, <i>φ</i>, are estimated as a function of the doped Fe³⁺ ions ratio. Furthermore, the dispersion energy, <i>E</i>_<i>d</i>, increased from 11.476 to 11.906 eV, while the single oscillator energy, <i>E</i>_<i>o</i>, decreased from 6.72 to 6.063 eV. These results evidence that the incorporation of Fe into the ZnO lattice leads to the tunability of the optical properties. Finally, the measurements of magnetization exhibit a hysteresis loop in Fe-doped ZnO nanofilms, confirming the presence of room-temperature ferromagnetism. Making the Fe-doped ZnO films is suitable for use in optoelectronic and spintronic device applications.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 11-12","pages":"1871 - 1883"},"PeriodicalIF":1.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evidence of Superconductivity in Electrical Resistance Measurements of Hydrides Under High Pressure","authors":"Fedor F. Balakirev,&nbsp;Vasily S. Minkov,&nbsp;Alexander P. Drozdov,&nbsp;Mikhail I. Eremets","doi":"10.1007/s10948-024-06792-9","DOIUrl":"10.1007/s10948-024-06792-9","url":null,"abstract":"","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 11-12","pages":"1779 - 1781"},"PeriodicalIF":1.6,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-024-06792-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calorimetric Investigation of Magnetic Transitions in GdPdAl and TbPdAl","authors":"Priyanshi Tiwari,&nbsp;Rajeev Joshi,&nbsp;Suman Karmakar,&nbsp;Kranti Kumar,&nbsp;A. K. Yogi,&nbsp;R. Rawat","doi":"10.1007/s10948-024-06830-6","DOIUrl":"10.1007/s10948-024-06830-6","url":null,"abstract":"<div><p>A comparative specific heat (C<span>(_{P})</span>) study of GdPdAl and TbPdAl compounds crystallizing in hexagonal ZrNiAl-type crystal-structure (space group P<span>(bar{6})</span>2 m) is presented. Consistent with earlier reports both the compounds show the signature of two magnetic transitions in magnetization data. The magnitude of the jump in C<span>(_{P})</span> at the high-temperature transition at T<span>(_{N1})</span> (<span>(sim )</span>47 K ) in GdPdAl indicates ordering into an amplitude-modulated magnetic structure. The analysis of magnetic entropy change (S<span>(_{4f})</span>) showed that about one-half of total S<span>(_{4f})</span> occurs below low temperature transition at T<span>(_{N2})</span>. This is in contrast to that seen in TbPdAl, where only one-third of the entropy of transition occurs below T<span>(_{N2})</span>. For both the compounds S<span>(_{4f})</span> tends to saturate to about 84% (for T &gt; T<span>(_{N1})</span>) of that expected for complete ordering of the rare earth moments, indicating incomplete removal of geometrical frustration.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 8-10","pages":"1773 - 1778"},"PeriodicalIF":1.6,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural, Magnetocaloric Effect and Critical Phenomena Studies of La0.8Na0.2Mn0.94Bi0.06O3 Synthesized by Sol–gel Technique","authors":"M. R. Laouyenne,&nbsp;M. Baazaoui,&nbsp;Mehdi Akermi,&nbsp; NejmeddineSmida","doi":"10.1007/s10948-024-06827-1","DOIUrl":"10.1007/s10948-024-06827-1","url":null,"abstract":"&lt;div&gt;&lt;p&gt;In this actual paper, we investigated the effect of elaboration technique on the structural, magnetic, magnetocaloric effect, landau theory and critical phenomena for the compounds &lt;b&gt;La&lt;/b&gt;&lt;sub&gt;&lt;b&gt;0.8&lt;/b&gt;&lt;/sub&gt;&lt;b&gt;Na&lt;/b&gt;&lt;sub&gt;&lt;b&gt;0.2&lt;/b&gt;&lt;/sub&gt;&lt;b&gt;Mn&lt;/b&gt;&lt;sub&gt;&lt;b&gt;0.94&lt;/b&gt;&lt;/sub&gt;&lt;b&gt;Bi&lt;/b&gt;&lt;sub&gt;&lt;b&gt;0.06&lt;/b&gt;&lt;/sub&gt;&lt;b&gt;O&lt;/b&gt;&lt;sub&gt;&lt;b&gt;3&lt;/b&gt;&lt;/sub&gt; synthesized by Solid-state reaction and Sol–Gel method. The structural study showed that the method of preparation does not affect the crystallization structure. Both of the compounds are indexed in the rhombohedral structure with the symmetry of R-3C. However, the unit cell volume of Sol–Gel compound is higher than Solid-state compound as well as the lattice parameters. We showed also that the length of the bandwidth of Sol–Gel compound is less than that of Solid-state compound that has a crucial role in the change of the magnetic properties. We displayed also in the structural part that the crystallite size of Sol–Gel compound is less than that of Solid-state compound due to the difference of the sintering temperature. In the magnetic study, M (T) curve displayed a ferromagnetic paramagnetic phase transition around the transitional point Tc. The several values of Tc are 310 K and 195 K for Solid-state compound and Sol–Gel compound, respectively. This difference is due to the difference between the crystallite size and in the other way, it can be explicated by the difference of the bandwidth, which creates a changed localization. The magnetic entropy change as a function of temperature displayed a broad transition from order to disorder state around the Curie temperature Tc. The several values of -ΔS&lt;sub&gt;M&lt;/sub&gt; at 5 T applied magnetic field is equal to 5.2 J/kg K and 2.5 J/kg K for SS and SG, respectively. The several values of the relative cooling power RCP are equal to 229 J kg&lt;sup&gt;−1&lt;/sup&gt; and 265 J kg&lt;sup&gt;−1&lt;/sup&gt; for Solid-state compound and Sol–Gel compound which are about 55% and 64% as compared with the gadolinium. The universal master curve showed that both of the compounds display a second-order phase transition. We confirmed the order of transition from the coefficient of the landau mean field theory. The comparison between the magnetic entropy change calculated through Maxwell relation and Landau theory showed a perfect coincidence between the two trends only in the high temperature part and there are some discrepancies in the low temperature section. We calculated the critical exponent β = 0.5 using the magnetic entropy change which lead to guess that the phase transition is defined in the Mean field model. The critical phenomena investigation displayed that the transition of Solid-state compound is described between the tricritical mean field model and 3D-Heseiberg model with β=0.188 and y=1.44. However, the Sol–Gel compound is completely described in the Mean field model with &lt;span&gt;(beta =0.51)&lt;/span&gt; and y=0.99. The authority of the determined exponent are confirmed with the scaling theory.&lt;/p&gt;&lt;/","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 11-12","pages":"1999 - 2012"},"PeriodicalIF":1.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Field-Induced Multistate Magnetization Switching in Ferromagnetic Nanowire with Parallel Anti-dots for Memristor Applications","authors":"Vemuru Haragopal,&nbsp;Rohan Jaiswal,&nbsp;Chandrasekhar Murapaka,&nbsp;Vijayanandhini Kannan","doi":"10.1007/s10948-024-06821-7","DOIUrl":"10.1007/s10948-024-06821-7","url":null,"abstract":"<div><p>Domain wall (DW)-based devices are attractive for mimicking synaptic behavior, which is fundamental to the realization of neuromorphic computing architecture. Unlike digital electronic devices, it requires analog switching. In this work, we demonstrate the multistate analog switching in a rectangular nanowire with multiple anti-dots using micromagnetic simulations. Anti-dots act as pinning sites for the DW motion during magnetization reversal. The vortex DWs nucleated during the reversal undergo transformation to transverse configuration due to the pinning at the anti-dots. The depinning of the transverse DW takes place in multiple steps. We have also observed the generation of multiple 360° DWs in this structure. The transverse DW breaks into smaller DWs during depinning, leading to stable magnetization states. The number of states achieved directly depends on the number of anti-dots introduced in the nanowire. By introducing six anti-dots, ten stable magnetization states are achieved. The change in demagnetization energy as a function of configuration, shape, and size of the DW is responsible for the observed multistate analog behavior.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 11-12","pages":"1793 - 1800"},"PeriodicalIF":1.6,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural, Optoelectronic, Magnetic, and Thermoelectric Properties of Titanium Ruthenate Quadruple Perovskites: A First Principle Investigation","authors":"Laila Almanqur,&nbsp;Shahid Mehmood","doi":"10.1007/s10948-024-06831-5","DOIUrl":"10.1007/s10948-024-06831-5","url":null,"abstract":"<div><p>Crystal structure, opto-electronic, magnetic, and thermoelectric properties of quadruple perovskites ACu₃Ti₂Ru₂O₁₂ (A = Ca, Sr, and Ba) are explored by the utilization of generalized gradient approximation (GGA) and GGA with Hubbard U in the framework of density functional theory (DFT). The optimized crystal structures and geometrical appearance are found compatible with the experiments. Cohesive energies (− 35.92 to − 39.41 Ry) and enthalpy of formation (− 1.79 to − 1.97 Ry) describe the stability of these compounds. Electrical resistivity and AFM phase profiles of electronic bands of these perovskites indicate that they are semiconductors with band gap ranging from 0.50 to 0.17 eV accordingly. In these compounds, the bandgap arise between the Ti and Ru <i>d</i> states electron and are direct band gap materials at <i>R</i> symmetry. They are active in the infrared part of the electromagnetic spectrum, according to their optical characteristics; this makes them shields for UV radiation and potential candidate for security monitoring devices. Thermoelectric properties of these compounds demonstrate that they are suitable candidate for thermoelectric generation. All of these perovskites are antiferromagnetic (AFM) which can be evident from their magnetic susceptibility and stable magnetic phase energies. As these perovskites are AFM semiconductor, due to this property, these perovskites could be used in magnetic cloaking and high-speed switching devices.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 11-12","pages":"1859 - 1870"},"PeriodicalIF":1.6,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural, Morphological, Electrical Resistivity, and Temperature-dependent Magnetic Property of Single-layered Amorphous Fe70Co15Zr7B5Cu3 HITPERM Films: The Effect of Thickness","authors":"Didwmsha Goyari,&nbsp;Perumal Alagarsamy","doi":"10.1007/s10948-024-06832-4","DOIUrl":"10.1007/s10948-024-06832-4","url":null,"abstract":"<div><p>Soft magnetic films play a crucial role in numerous technological applications, such as magnetoelectronics, telecommunications, and magnetic recording, and the tuning of properties to obtain high-efficiency demands searching new materials and controlling thickness and compositions. In this regard, we report a systematic investigation of structural, morphological, electrical resistivity, and temperature-dependent magnetic properties of single-layer amorphous Fe₇₀Co₁₅Zr₇B₅Cu₃ HITPERM (<i>t</i> = 5–100 nm) films deposited on a low-cost thermally oxidized Si substrate. Structural studies (XRD and TEM) reveal an amorphous nature in all as-deposited films. Surface morphology shows that the average roughness increases with increasing <i>t</i> up to 50 nm and then decreases at higher thicknesses. The electrical resistivity decreases rapidly as <i>t</i> increases from 5 to 10 nm and then is invariant for films with <i>t</i> ≥ 30 nm. Interestingly, the variation of resistivity follows the Boltzmann fitting. These films exhibit tunable magnetic properties between soft (<i>t</i> &lt; 20 nm) and semi-hard (20 nm &lt; <i>t</i> &lt; 70 nm) properties with rectangular-type magnetic hysteresis loops having ~ 100% remanence ratios (<i>M</i>_<i>r</i><i>/M</i>_<i>s</i>), low coercivity (<i>H</i>_<i>c</i> &lt; 2.5 kA/m), and low saturation magnetic field (<i>H</i>_<i>s</i> &lt; 3 kA/m) for <i>t</i> ≤ 70 nm. Transcritical hysteresis loop with a large <i>H</i>_<i>c</i> &gt; 6.7 kA/m, high <i>H</i>_<i>s</i> &gt; 26.5 kA/m, and reduced <i>M</i>_<i>r</i><i>/M</i>_<i>s</i> ~ 55% is observed for <i>t</i> = 100 nm film. High-temperature thermomagnetization curves display two magnetic phase transitions (<i>T</i>_<i>C</i>) corresponding ferromagnetic state to a paramagnetic state of the amorphous phase (at 820 K during warming) and nanocrystalline phase (at 1003 K during cooling). The observed results of HITPERM films with large <i>T</i>_<i>C</i> naturally make it a potential choice for applications not only in magnetoelectronics at room temperature but also for aircraft power devices at higher temperatures.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"37 8-10","pages":"1763 - 1771"},"PeriodicalIF":1.6,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}