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Cubic anisotropy in (Ga,Mn) As layers: Experiment and theory
Polish Acad Sci, Poland.
Polish Acad Sci, Poland.
Polish Acad Sci, Poland.
Polish Acad Sci, Poland.
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 18, article id 184403Article in journal (Refereed) Published
Abstract [en]

Historically, comprehensive studies of dilute ferromagnetic semiconductors, e.g., p-type (Cd,Mn) Te and (Ga,Mn) As, paved the way for a quantitative theoretical description of effects associated with spin-orbit interactions in solids, such as crystalline magnetic anisotropy. In particular, the theory was successful in explaining uniaxial magnetic anisotropies associated with biaxial strain and nonrandom formation of magnetic dimers in epitaxial (Ga,Mn) As layers. However, the situation appears much less settled in the case of the cubic term: the theory predicts switchings of the easy axis between in-plane < 100 > and < 110 > directions as a function of the hole concentration, whereas only the < 100 > orientation has been found experimentally. Here, we report on the observation of such switchings by magnetization and ferromagnetic resonance studies on a series of high-crystalline quality (Ga,Mn) As films. We describe our findings by themean-field p-d Zener model augmented with three new ingredients. The first one is a scattering broadening of the hole density of states, which reduces significantly the amplitude of the alternating carrier-induced contribution. This opens the way for the two other ingredients, namely the so-far disregarded single-ion magnetic anisotropy and disorder-driven nonuniformities of the carrier density, both favoring the < 100 > direction of the apparent easy axis. However, according to our results, when the disorder gets reduced, a switching to the < 110 > orientation is possible in a certain temperature and hole concentration range.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 18, article id 184403
National Category
Physical Sciences
Research subject
Natural Science, Physics
Identifiers
URN: urn:nbn:se:lnu:diva-76812DOI: 10.1103/PhysRevB.97.184403ISI: 000431989000003Scopus ID: 2-s2.0-85047133231OAI: oai:DiVA.org:lnu-76812DiVA, id: diva2:1232451
Available from: 2018-07-11 Created: 2018-07-11 Last updated: 2019-08-29Bibliographically approved

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Sadowski, Janusz

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  • apa
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