Ferromagnetism of GaMnAs studied by polarized neutron reflectometry

被引：2
|
作者：
Kepa, H [1 ]
Kutner-Pielaszek, J
Twardowski, A
Majkrzak, CF
Sadowski, J
Story, T
Giebultowicz, TM
机构：
[1] Univ Warsaw, Inst Expt Phys, Hoza 69, PL-00681 Warsaw, Poland
[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[3] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[4] Chalmers Univ Technol, Dept Expt Phys, SE-41296 Gothenburg, Sweden
[5] Univ Gothenburg, SE-41296 Gothenburg, Sweden
[6] Oregon State Univ, Dept Phys, Corvallis, OR 97331 USA
来源：
PHYSICAL REVIEW B | 2001年 / 64卷 / 12期
关键词：
D O I：
10.1103/PhysRevB.64.121302
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Polarized neutron reflectometry has been used to investigate details of spin ordering in ferromagnetic (FM) GaMnAs/GaAs superlattices. The reflectivity spectra measured below the Curie temperature reveal additional magnetic contributions to the structural superlattice Bragg peaks, clearly indicating the existence of FM interlayer correlations. Closer investigation of the magnetic reflectivity maxima using a full polarization analysis provides direct evidence that the FM order is the GaMnAs layers is truly long range. Moreover, as shown by the data, the system exhibits a strong tendency of forming a single-domain FM arrangement, even when cooled through Tc in zero external field.
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页数：4
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