Magnetocrystalline anisotropy controlled local magnetic configurations in (Ga,Mn)As spin-transfer-torque microdevices

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dc.creatorWunderlich, J.
dc.creatorIrvine, A. C.
dc.creatorZemen, J.
dc.creatorHoly, V.
dc.creatorRushforth, A. W.
dc.creatorDe Ranieri, E.
dc.creatorRana, U.
dc.creatorVyborny, K.
dc.creatorSinova, Jairo
dc.creatorFoxon, C. T.
dc.creatorCampion, R. P.
dc.creatorWilliams, D. A.
dc.creatorGallagher, B. L.
dc.creatorJungwirth, T.
dc.date2007-07-23
dc.date.accessioned2026-07-07T08:19:40Z
dc.date.available2026-07-07T08:19:40Z
dc.descriptionThe large saturation magnetization in conventional dense moment ferromagnets offers flexible means of manipulating the ordered state through demagnetizing shape anisotropy fields but these dipolar fields, in turn, limit the integrability of magnetic elements in information storage devices. We show that in a (Ga,Mn)As dilute moment ferromagnet, with comparatively weaker magnetic dipole interactions, locally tunable magnetocrystalline anisotropy can take the role of the internal field which determines the magnetic configuration. Experiments and theoretical modeling are presented for lithographically patterned microchannels and the phenomenon is attributed to lattice relaxations across the channels. The utility of locally controlled magnetic anisotropies is demonstrated in current induced switching experiments. We report structure sensitive, current induced in-plane magnetization switchings well below the Curie temperature at critical current densities 10^5 Acm^-2. The observed phenomenology shows signatures of a contribution from domain-wall spin-transfer-torque effects.
dc.description9 pages, 9 figures, Phys. Rev. B in press
dc.identifierhttps://arxiv.org/abs/0707.3329
dc.identifierhttp://arxiv.org/abs/0707.3329
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/134843
dc.subjectMesoscale and Nanoscale Physics
dc.subjectMaterials Science
dc.titleMagnetocrystalline anisotropy controlled local magnetic configurations in (Ga,Mn)As spin-transfer-torque microdevices
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