Anomalous structural behavior in the metamagnetic transition of FeRh thin films from a local viewpoint

被引：13
|
作者：
Wakisaka, Yuki [1 ,2 ]
Uemura, Yohei [2 ]
Yokoyama, Toshihiko [1 ,2 ]
Asakura, Hiroyuki [3 ]
Morimoto, Hiroyuki [3 ]
Tabuchi, Masao [3 ]
Ohshima, Daiki [4 ]
Kato, Takeshi [5 ]
Iwata, Satoshi [4 ]
机构：
[1] Nagoya Univ, Grad Sch Sci, Chikusa Ku, Nagoya, Aichi 4648602, Japan
[2] Inst Mol Sci, Dept Mat Mol Struct, Okazaki, Aichi 4448585, Japan
[3] Nagoya Univ, Synchrotron Radiat Res Ctr, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[4] Nagoya Univ, EcoTopia Sci Inst, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[5] Nagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan
来源：
PHYSICAL REVIEW B | 2015年 / 92卷 / 18期
基金：
日本学术振兴会;
关键词：
ANTIFERROMAGNETIC-FERROMAGNETIC TRANSITION; MAGNETIC TRANSITION; ALLOYS; IFEFFIT;
D O I：
10.1103/PhysRevB.92.184408
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The metamagnetic transition in FeRh thin films has been investigated via temperature-dependent x-ray-absorption fine-structure spectroscopy in order to gain correlations between magnetization and local electronic and geometric structures. According to the Fe and Rh K-edge x-ray-absorption near-edge structure (XANES), strong hybridization between Fe and Rh was revealed to exist. This Fe-Rh hybridization was observed to decrease during the phase transition from the antiferromagnetic (AFM) to ferromagnetic (FM) phases from the systematic change in the Fe K-edge XANES. In addition, only the Debye-Waller factor of the Fe-Fe pair in the AFM phase was observed to be considerably enhanced when compared with that in the FM phase, which was ascribed to local structural fluctuation inherent in the AFM phase. By considering the different features of the exchange interactions in Fe-Rh and Fe-Fe, this anomalous behavior is interpreted as being consistent with the recent theoretical study proposing the local fluctuations of spin and structure. Therefore, we consider that the local spin and Fe-Fe distance fluctuations play an important role in driving the metamagnetic transition, whereas the Fe-Rh hybridization correlates with the static stability of each magnetic phase.
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页数：7
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