Asymmetric "melting" and "freezing" kinetics of the magnetostructural phase transition in B2-ordered FeRh epilayers
Asymmetric "melting" and "freezing" kinetics of the magnetostructural phase transition in B2-ordered FeRh epilayers
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DOI：
10.1063/1.4883369
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发表时间：
2014-06-09
影响因子：
4
通讯作者：
Marrows, C. H.
中科院分区：
文献类型：
--
作者：
de Vries, M. A.;Loving, M.;Marrows, C. H.
利用同步辐射X射线衍射研究了在MgO衬底上溅射生长的B2有序FeRh（001）外延层的磁结构转变过程。在滞后制度的过渡面外晶格常数的测量揭示了一个微观结构与空间上不同的区域中的晶格膨胀和收缩相共存。结果发现，相分离是更明显的冷却过程中比加热。此外，虽然跨越膜的高度的晶格扩展域可以过冷几个开尔文，但没有等效的过热。这种不对称之间的冷却和加热过程中的FeRh是一致的通用的冻结和熔融转变的动力学的差异。(C)2014 AIP Publishing LLC.
Synchrotron X-ray diffraction was used to study the phase transformation processes during the magnetostructural transition in a B2-ordered FeRh (001)-oriented epilayer grown on MgO by sputtering. Out-of-plane lattice constant measurements within the hysteretic regime of the transition reveal a microstructure consistent with the coexistence of lattice-expanded and contracted phases in spatially distinct regions. It was found that the phase separation is more pronounced during cooling than heating. Furthermore, whilst lattice-expanded domains that span the height of the film can be undercooled by several kelvins, there is no equivalent superheating. This asymmetry between the cooling and heating processes in FeRh is consistent with the difference in the kinetics of generic freezing and melting transitions. (C) 2014 AIP Publishing LLC.