Physics – Condensed Matter – Materials Science
Scientific paper
2008-02-22
New J. Phys. 10 (2008), 065003
Physics
Condensed Matter
Materials Science
11 pages, 4 figures, references fixed
Scientific paper
10.1088/1367-2630/10/6/065003
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.
Ahmed Ebad
Campion R. P.
Foxon C. T.
Gallagher B. L.
Irvine Andrew C.
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