Impact of growth conditions on the structural and magnetic properties of (Zn,Fe)Te thin films grown by molecular beam epitaxy (MBE)

被引：1
作者：
Saha, Indrajit [1 ,2 ]
Kanazawa, Ken [1 ]
Nitani, Hiroaki [3 ]
Kuroda, Shinji [1 ]
机构：
[1] Univ Tsukuba, Inst Mat Sci, 1-1-1 Tennoudai, Tsukuba, Ibaraki 3058573, Japan
[2] Chottogram Vet & Anim Sci Univ, Dept Phys & Math Sci, Khulshi 4225, Chottogram, Bangladesh
[3] High Energy Accelerator Res Org KEK, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan
来源：
JOURNAL OF CRYSTAL GROWTH | 2022年 / 580卷
基金：
日本学术振兴会;
关键词：
Molecular beam epitaxy; Tellurites; Magnetic materials  van-Vleck paramagnetism; Ferromagnetism; Blocking phenomena; TEMPERATURE FERROMAGNETISM; K-EDGE; FE; IRON; SEMICONDUCTORS; COORDINATION; STATES; ZN;
D O I：
10.1016/j.jcrysgro.2021.126492
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
We have investigated the effect of growth conditions on the structural and magnetic properties of (Zn,Fe)Te. Thin films of Zn1-xFexTe are grown by molecular beam epitaxy (MBE) with an almost same Fe composition, x = 1.4% but under two different growth conditions: (a) Te-rich (Te/Zn flux ratio of 2.3) and (b) Zn-rich (Te/Zn flux ratio of 0.7). Structural analysis by using x-ray absorption fine structure (XAFS) reveals that both films are mainly composed of pure diluted phase with substitutional Fe atoms on the Zn-site, but the valence state of Fe atoms in the film grown under Zn-rich condition has deviated more from isoelectronic Fe2+ as compared to the one grown in Te-rich condition. Accordingly, the magnetization measurement using SQUID confirms a significant difference in magnetic properties among these films; a linear dependence of magnetization on magnetic field (M -H), typical of van-Vleck paramagnetism under Te-rich growth condition turns into ferromagnetic behaviors with hysteretic M -H curve in the Zn-rich condition. The ferromagnetism exhibited by the Zn-rich growth film may reflect the deviation of substitutional Fe valence state from Fe2+ to Fe2+/3+ mixed states.
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页数：6
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