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Cubic anisotropy in...
Cubic anisotropy in (Ga,Mn) As layers : Experiment and theory
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- Sawicki, M. (författare)
- Polish Acad Sci, Poland,Institute of Physics of the Polish Academy of Sciences
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- Proselkov, O. (författare)
- Polish Acad Sci, Poland,Institute of Physics of the Polish Academy of Sciences
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- Sliwa, C. (författare)
- Polish Acad Sci, Poland,Institute of Physics of the Polish Academy of Sciences
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- Aleshkevych, P. (författare)
- Polish Acad Sci, Poland,Institute of Physics of the Polish Academy of Sciences
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- Domagala, J. Z. (författare)
- Polish Acad Sci, Poland,Institute of Physics of the Polish Academy of Sciences
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- Sadowski, Janusz (författare)
- Lund University,Lunds universitet,Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE),Polish Acad Sci, Poland;Lund University, Sweden,MAX IV-laboratoriet,MAX IV Laboratory,International Research Centre MagTop,Tohoku University
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- Dietl, T. (författare)
- Linnaeus University
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(creator_code:org_t)
- American Physical Society, 2018
- 2018
- Engelska.
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Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 97:18
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Physics
- Fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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