Room temperature ferromagnetism of Ge/MnAs digital alloys

被引：0
|
作者：
Lee, JJ [1 ]
Kim, MY [1 ]
Cui, Y [1 ]
Song, JH [1 ]
Freeman, AJ [1 ]
Ketterson, JB [1 ]
机构：
[1] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
来源：
JOURNAL OF SUPERCONDUCTIVITY | 2005年 / 18卷 / 01期
基金：
美国国家科学基金会;
关键词：
Ge/MnAs digital alloys; ferromagnetism; Carie Temperature;
D O I：
10.1007/s10948-005-2153-9
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The magnetic properties of Ge/MnAs digital alloys on GaAs (001) substrates, grown by molecular beam epitaxy, were investigated using a Quantum Design SQUID magnetometer. The Ge (1 nm)/MnAs (0.15 nm) digital alloy showed ferromagnetism up to 334 K with a coercive field of 576 Oe at room temperature, as determined from temperature-dependent magnetization and hysteresis loop measurements. The ferromagnetic and antiferromagnetic phases of a Ge7/(Mn0.5As0.5)(1) superlattice, investigated using the full-potential linearized augmented plane wave (FLAPW) method yielded a ferromagnetic ground state with a high spin magnetic moment of Mn (3.45 mu(B)) which induces only very small magnetic moments on its neighboring As or Ge atoms.
引用
收藏
页码：75 / 78
页数：4
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