Growth and magnetic properties of (Ga,Mn)As as digital ferromagnetic heterostructures

被引：0
|
作者：
Kawakami, RK
Johnston-Halperin, E
Chen, LF
Hanson, M
Guébels, N
Stephens, JM
Speck, JS
Gossard, AC
Awschalom, DD [1 ]
机构：
[1] Univ Calif Santa Barbara, Dept Phys, Ctr Spintron & Quantum Computat, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Dept Mat, Ctr Spintron & Quantum Computat, Santa Barbara, CA 93106 USA
来源：
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2002年 / 88卷 / 2-3期
关键词：
digital ferromagnetic heterostructures ferromagnetic transition temperature; structural and magnetic properties;
D O I：
10.1016/S0921-5107(01)00906-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
(Ga,Mn)As digital ferromagnetic heterostructures (DFH) are grown by incorporating Mn delta-doping layers into GaAs using molecular beam epitaxy. Investigation of structural properties (via X-ray diffraction, TEM, RHEED) and magnetic properties (via SQUID, MOKE) as a function of growth temperature reveal the following: (1) a DFH growth window from 240 to 280 degreesC, (2) a strong dependence of the ferromagnetic transition temperature (T-C) on growth temperature. The dependence of T-C on the spacing between Mn layers is also investigated, and non-zero T-C is observed for spacing as high as 200 ML of GaAs. Furthermore, magnetic measurements on a single layer of Mn delta-doping indicate that this ultrathin film is ferromagnetic. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：209 / 212
页数：4
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