Structural, Magnetic, and Low-Temperature Electrical Transport Properties of YIG Thin Films with Heavily Reduced Oxygen Contents
Structural, Magnetic, and Low-Temperature Electrical Transport Properties of YIG Thin Films with Heavily Reduced Oxygen Contents
复制标题
氧含量大幅降低的 YIG 薄膜的结构、磁性和低温电传输特性
DOI：
10.1021/acsaelm.1c00195
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发表时间：
2021-08
影响因子：
4.7
通讯作者：
Yonggang Zhao
中科院分区：
文献类型：
--
作者：
Venkat Swamy;Shu Mi;Haoliang Huang;Chenguang Mei;Yalin Lu;Dongsheng Song;Haifeng Du;Yonggang Zhao
钇铁石榴石(YIG)在自旋电子器件中的应用引起了人们的极大兴趣。以往的报道表明，氧含量对调节YIG薄膜的结构和磁性是必不可少的。但由于含氧量变化不大，效果不明显。探索氧含量大大降低的YIG的性质是一件有趣的事情，到目前为止还没有报道。本文报道了用石墨退火制备的氧含量大幅度降低的YIG薄膜及其结构、磁性和电输运性质。样品的饱和磁化强度和晶格参数均随氧含量的降低而减小。此外，YIG薄膜的电阻率可以降低到几个数量级，因此首次研究了YIG薄膜的低温电输运特性。在100K以上，电输运主要由热激活行为主导，而在100K以下，570℃退火样表现为Mott变范围跳跃电导，其余样品表现为隧道电导。这项工作表明氧含量大幅降低的YIG的性能发生了戏剧性的变化，并为调整其他含氧量的材料铺平了道路。
Yttrium–iron–garnet (YIG) is attracting a lot of interest due to its applications in spintronic devices. Previous reports have shown that oxygen content is essential for tuning the structural and magnetic properties of YIG films. However, the effect was not remarkable due to the small change of oxygen content. It is interesting to explore the properties of YIG with greatly reduced oxygen contents, which has not been reported so far. Here we report on YIG thin films with heavily reduced oxygen contents via annealing with graphite, and their structural, magnetic, and electrical transport properties. Both the saturation magnetization and lattice parameter of the samples decrease with reduced oxygen content. Moreover, electrical resistivity can be reduced up to several orders of magnitude, so the low-temperature electrical transport properties of YIG thin films are studied for the first time. The electrical transport is dominated by the thermal activation behavior above 100 K. While below 100 K, it shows Mott-variable range hopping conduction for the 570 °C annealed sample and tunneling conduction for the other samples. This work indicates dramatic changes of properties for YIG with heavily reduced oxygen contents and paves the way for tuning other materials with oxygen content.
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影响因子：
3.7
作者：
N. Thiéry;V. Naletov;L. Vila;A. Marty;A. Brenac;J. Jacquot;G. D. Loubens;M. Viret;A. Anane;V. Cros;J. Youssef;V. Demidov;S. Demokritov;O. Klein
通讯作者：
N. Thiéry;V. Naletov;L. Vila;A. Marty;A. Brenac;J. Jacquot;G. D. Loubens;M. Viret;A. Anane;V. Cros;J. Youssef;V. Demidov;S. Demokritov;O. Klein
影响因子：
4
作者：
d'Allivy Kelly, O.;Anane, A.;Fert, A.
通讯作者：
Fert, A.
影响因子：
2.1
作者：
J. Livingston
通讯作者：
J. Livingston
影响因子：
8.6
作者：
Sun, Yiyan;Chang, Houchen;Hoffmann, Axel
通讯作者：
Hoffmann, Axel
影响因子：
41.2
作者：
Jeen, Hyoungjeen;Choi, Woo Seok;Lee, Ho Nyung
通讯作者：
Lee, Ho Nyung