Magnetothermodynamic Properties and Anomalous Magnetic Phase Transition in FeRh Nanowires
Magnetothermodynamic Properties and Anomalous Magnetic Phase Transition in FeRh Nanowires
复制标题
FeRh 纳米线的磁热力学性质和反常磁相变
DOI：
10.1109/tmag.2018.2832191
复制
发表时间：
2018
影响因子：
2.1
通讯作者：
Matsumoto K
中科院分区：
文献类型：
--
作者：
Matsumoto K
从一阶反铁磁到铁磁相变的输运性质的测量来评估Pd掺杂FeRh合金的亚微米线的热性质。最近，在亚微米线的FeRh合金，加热和冷却过程之间的不对称结构的相变温度附近的报道。一个有限尺寸效应出现的系统，预计将显示出不同的磁和热性能从那些在散装和薄膜。然而，热或磁化测量是很难执行的样品与这样一个微小的体积。在这里，我们展示了在MgO（001）上生长的B2有序的Pd掺杂的FeRh合金的薄膜和亚微米线的热性能的定量评估。对一系列不同宽度导线的电阻率测量表明，电阻变化的异常在窄导线中增强。由于亚微米线的输运性质敏感地反映了这些磁状态，通过电阻测量确定了一级相变过程中的熵变和不可逆能量损失。我们发现一个更大的能量损失在较小的样品中，更广泛的磁滞回线出现在温度驱动的测量。该方法可以作为一种探测器来评估有限尺寸效应的限制磁畴成核过程中的相变。
Thermal properties of submicrometer wires of Pd-doped FeRh alloys are evaluated from measurements of transport properties around the first-order antiferromagnetic to ferromagnetic phase transition. Recently, in a submicrometer wire of FeRh alloy, an asymmetric structure between heating and cooling processes was reported in the vicinity of the phase transition temperature. A system where finite-size effects appear is expected to show different magnetic and thermal properties from those in bulk and thin film. However, thermal or magnetization measurements are difficult to perform on samples with such a tiny volume. Here, we demonstrate a quantitative evaluation of thermal properties in thin films and submicrometer wires of B2-ordered Pd-doped FeRh alloy grown on MgO (001). Resistivity measurements on a series of wires with different widths reveal that the anomaly in the resistance change is enhanced in narrow wires. As the transport properties in submicrometer wires sensitively reflect those magnetic states, the entropy change and the irreversible energy loss during the first-order phase transition have been determined via resistance measurements. We find a larger energy loss in smaller samples where wider hysteresis loops appear in temperature-driven measurements. This method can be a probe to evaluate the finite-size effect induced by a restricted magnetic domain nucleation process during the phase transition.
登录
查看更多内容
影响因子：
41.2
作者：
Marti, X.;Fina, I.;Ramesh, R.
通讯作者：
Ramesh, R.
影响因子：
6.1
作者：
Le Graet, C.;Charlton, T. R.;Marrows, C. H.
通讯作者：
Marrows, C. H.
Fe(Rh1−xPdx) 合金的磁热效应
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
K. Nishimura;Y. Nakazawa;Lingwei Li;K. Mori
通讯作者：
K. Mori
影响因子：
3.3
作者：
de Vries, M. A.;Loving, M.;Marrows, C. H.
通讯作者：
Marrows, C. H.
影响因子：
4
作者：
de Vries, M. A.;Loving, M.;Marrows, C. H.
通讯作者：
Marrows, C. H.