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Preparation of Single Crystals of Co_xZn_(1-x)S and Co_xZn_(1-x)Se—New Materials of Dilute Magnetic Semiconductors

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Rare Metals 1990年第2期10卷 139-144页

作者： Gu Xiamin Giriat W. furdyna J.k.Shanhai Institute of Metallurgy,Academia Sinica 200050 China Department of Physics University of Notre Dame.Indiana 46556,U. S. A Acad Sinica Shanghai Inst of Metallurgy China

In this paper, we report the growth of single crystals of Co_x Zn_(1-x)S and Co_x Zn_(1-x)Se (0 详细信息

In this paper, we report the growth of single crystals of Co_x Zn_(1-x)S and Co_x Zn_(1-x)Se (0

关键词： Co x)Se New Materials of Dilute Magnetic Semiconductors Preparation of Single Crystals of Co_xZn x)S and Co_xZn

新型稀磁性半导体材料Co_xZn_(1-x)S与Co_xZn-(1-x)Se单晶的制备

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稀有金属 1991年第4期15卷 250-254页

作者：顾霞敏 W.Giriat J.k.furdyna 中国科学院上海冶金研究所 University of Notre Dame USA

本实验首次利用碘做媒介剂,采用化学气相输运法制得稀磁性半导体Co_xZn_(1-x)S和Co_xZn_(1-x)Se(0 详细信息

本实验首次利用碘做媒介剂,采用化学气相输运法制得稀磁性半导体Co_xZn_(1-x)S和Co_xZn_(1-x)Se(0

关键词：稀增性半导体单晶化学气相运输

Control of Coherent Magnetization Precession in GaMnAs by Ultrafast Optical Excitation

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Control of Coherent Magnetization Precession in GaMnAs by Ul...

Interlayer exchange coupling in (Ga,Mn) As ferromagnetic semiconductor multilayer systems

2007亚洲光电子会议非线形光学及应用分会场

作者： J. k. furdyna I. E. Perakis N. Tolk Department of Physics University of Notre Dame Notre Dame IN 46556 Department of Physics University of Crete Heraklion 71409 Greece Department of Physics and Astronomy Vanderbilt University Nashville TN 37235

We report comprehensive temperature and photoexcitation intensity dependent studies of the photoinduced magnetization precession in Ga1-xMnxAs (x = 0.035) by time-resolved kerr rotation measurements. We observe coherent oscillations of local Mn spins triggered by an ultrafast photo-induced reorientation of the easy axis due to changes in the magnetic anisotropy. The amplitude saturation of these oscillations above certain pump intensity is indicative of stabilization of the magnetic easy axis orientation on temperatures above c/2. We find that the observed magnetization precession damping (Gilbert damping) is strongly dependent on pump laser intensity, but largely independent of ambient temperature.

关键词： Magnetization precession Gilbert damping

来源： cnki会议评论

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Journal of Semiconductors 2019年第8期40卷 28-35页

作者： Sanghoon Lee Sunjae Chung Hakjoon Lee Xinyu Liu M. Dobrowolska J. k. furdyna Department of Physics Korea University Seoul 136-701 Korea Department of Physics University of Notre Dame Notre Dame Indiana 46556 USA

This paper describes interlayer exchange coupling (IEC) phenomena in ferromagnetic multilayer structures, focusing on the unique IEC features observed in ferromagnetic semiconductor (Ga,Mn)As-based systems. The dependence of IEC on the structural parameters, such as non-magnetic spacer thickness, number of magnetic layers, and carrier density in the systems has been investigated by using magnetotransport measurements. The samples in the series show both a typical anisotropic magnetoresistance (AMR) and giant magnetoresistance (GMR)-like effects indicating realization of both ferromagnetic (FM) and antiferromagnetic (AFM) IEC in (Ga,Mn)As-based multilayer structures. The results revealed that the presence of carriers in the nonmagnetic spacer is an important factor to realize AFM IEC in this system. The studies further reveal that the IEC occurs over a much longer distance than predicted by current theories, strongly suggesting that the IEC in (Ga,Mn)As-based multilayers is a long-range interaction. Due to the long-range nature of IEC in the (Ga,Mn)As-based systems, the next nearest neighbor (NNN) IEC cannot be ignored and results in multi-step transitions during magnetization reversal that correspond to diverse spin configurations in the system. The strength of NNN IEC was experimentally determined by measuring minor loops that correspond to magnetization flips in specific (Ga,Mn)As layer in the multilayer system.

关键词： thin film crystal ferromagnetic semiconductor interlayer coupling

MAGNETICALLY-TUNABLE SPIN-SELECTIVE POSITIONING OF WAVE FUNCTIONS IN SYMMETRIC MULTIPLE QUANTUM WELLS

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MAGNETICALLY-TUNABLE SPIN-SELECTIVE POSITIONING OF WAVE FUNC...