Lithographically and electrically controlled strain effects on anisotropic magnetoresistance in (Ga,Mn)As

Autor:	Tomas Jungwirth, E. De Ranieri, B. L. Gallagher, U. Rana, A. W. Rushforth, E. Ahmed, C. T. Foxon, Jörg Wunderlich, K. Vyborny, Andrew C. Irvine, R. P. Campion
Rok vydání:	2008
Předmět:	Condensed Matter - Materials Science Materials science Lattice constant Magnetoresistance Condensed matter physics Lattice (order) General Physics and Astronomy Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Anisotropy Lithography Piezoelectricity
DOI:	10.48550/arxiv.0802.3344
Popis:	It has been demonstrated that magnetocrystalline anisotropies in (Ga,Mn)As are sensitive to lattice strains as small as 10^-4 and that strain can be controlled by lattice parameter engineering during growth, through post growth lithography, and electrically by bonding the (Ga,Mn)As sample to a piezoelectric transducer. In this work we show that analogous effects are observed in crystalline components of the anisotropic magnetoresistance (AMR). Lithographically or electrically induced strain variations can produce crystalline AMR components which are larger than the crystalline AMR and a significant fraction of the total AMR of the unprocessed (Ga,Mn)As material. In these experiments we also observe new higher order terms in the phenomenological AMR expressions and find that strain variation effects can play important role in the micromagnetic and magnetotransport characteristics of (Ga,Mn)As lateral nanoconstrictions. Comment: 11 pages, 4 figures, references fixed
Databáze:	OpenAIRE
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