Peculiarities of the phase transformation dynamics in bulk FeRh based alloys from magnetic and structural measurements
Peculiarities of the phase transformation dynamics in bulk FeRh based alloys from magnetic and structural measurements
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DOI：
10.1016/j.jmmm.2020.167560
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发表时间：
2021-03
影响因子：
2.7
通讯作者：
Vladimir I. Zverev;R. Gimaev;T. Miyanaga;A. A. Vaulin-A.;A. Gubkin;Boris B. Kovalev;Antonio M. dos Santos;E. Lovell;L. Cohen;N. Zarkevich
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文献类型：
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作者：
Vladimir I. Zverev;R. Gimaev;T. Miyanaga;A. A. Vaulin-A.;A. Gubkin;Boris B. Kovalev;Antonio M. dos Santos;E. Lovell;L. Cohen;N. Zarkevich
利用中子衍射、磁化和扫描霍尔探针成像等方法，分析了铁铑合金中反铁磁相和铁磁相共存的现象，并与Pd、Fe 50，4 Rh 4,9，6、Fe 4,9，7 Rh 47，4Pd 2，9和Fe 48，3Rh 46，8 Pd 4，9进行了比较。的晶格参数，AFM和FM相的重量分数，和Fe磁矩值的温度依赖性，得到在整个AFM-FM过渡的冷却和加热。在冷却-加热过程中，观察到相的重量分数具有显著的热磁滞后，晶胞体积具有相对较窄的热磁滞后。滞后行为对Pd浓度的明显依赖已被追踪。使用扫描霍尔探针显微镜，这揭示了在外部磁场的存在下的相共存和过渡的空间进展的长度尺度的相变的空间分布的额外的直接磁测量。此外，磁相图已被构建为一系列的Pd掺杂的FeRh合金。
We analyze coexistence of antiferromagnetic and ferromagnetic phases in bulk iron-rhodium and its alloys with palladium, Fe50,4Rh49,6, Fe49,7Rh47,4Pd2,9and Fe48,3Rh46,8Pd4,9, using neutron diffraction, magnetization and scanning Hall probe imaging. Temperature dependencies of the lattice parameters, AFM and FM phase weight fractions, and Fe magnetic moment values were obtained on cooling and heating across the AFM-FM transition. Substantial thermomagnetic hysteresis for the phases’ weight fractions and a relatively narrow one for the unit cell volume has been observed on cooling-heating. A clear dependence of hysteretic behavior on Pd concentration has been traced. Additional direct magnetic measurements of the spatial distribution of the phase transition are acquired using scanning Hall probe microscopy, which reveals the length scale of the phase coexistence and the spatial progression of the transition in the presence of external magnetic field. Also, the magnetic phase diagram has been constructed for a series of Pd-doped FeRh alloys.