Cubic anisotropy in high homogeneity thin (Ga,Mn)As layers

Abstract

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 {\em uniaxial} magnetic anisotropies associated with biaxial strain and non-random formation of magnetic dimers in epitaxial (Ga,Mn)As layers. However, the situation appears much less settled in the case of the {\em 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 the mean-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 non-uniformities 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.

arXiv comment12 pages, 9 figures

References in corpus (39)

• Hole-mediated ferromagnetism in tetrahedrally coordinated semiconductors
• Theory of ferromagnetic (III,Mn)V semiconductors
• Dilute ferromagnetic semiconductors: Physics and spintronic structures
• Mn Interstitial Diffusion in (Ga,Mn)As
• Giant Planar Hall Effect in Epitaxial (Ga,Mn)As Devices
• High Curie temperature GaMnAs obtained by resistance-monitored annealing
• Visualizing Critical Correlations near the Metal-Insulator Transition in Ga1-xMnxAs
• Experimental probing of the interplay between ferromagnetism and localisation in (Ga,Mn)As
• In-plane uniaxial anisotropy rotations in (Ga,Mn)As thin films
• Sensitive SQUID magnetometry for studying nano-magnetism
• Spin-dependent phenomena and device concepts explored in (Ga,Mn)As
• Temperature Dependent Magnetic Anisotropy in (Ga,Ma)As Layers
• Temperature Dependent Magnetic Anisotropy in (Ga,Mn)As Layers
• Reorientation Transition in Single-Domain (Ga,Mn)As
• Enhanced annealing, high Curie temperature and low-voltage gating in (Ga,Mn)As: A surface oxide control study
• Interplay between carrier localization and magnetism in diluted magnetic and ferromagnetic semiconductors
• Magneto crystalline anisotropies in (Ga,Mn)As: A systematic theoretical study and comparison with experiment
• Piezo-control of magnetic anisotropy in GaMnAs: Reversible manipulation of magnetization orientation and irreversible magnetization switching
• Curie temperature versus hole concentration in field-effect structures of Ga1-xMnxAs
• Origin of bulk uniaxial anisotropy in zinc-blende dilute magnetic semiconductors
• Structural and magnetic properties of GaMnAs layers with high Mn content grown by Migration Enhanced Epitaxy on GaAs(100) substrates
• Probing hole-induced ferromagnetic exchange in magnetic semiconductors by inelastic neutron scattering
• Post-growth annealing of GaMnAs under As capping - an alternative way to increase Tc
• Evolution of the magnetic anisotropy with carrier density in hydrogenated (Ga,Mn)As
• Transport Characterization of the Magnetic Anisotropy of (Ga,Mn)As
• Detailed transport investigation of the magnetic anisotropy of (Ga,Mn)As
• Magnetic anisotropy switching in (Ga,Mn)As with increasing hole concentration
• Magnetic anisotropy of epitaxial (Ga,Mn)As on (113)A GaAs
• On the origin of magnetism in (Ga,Mn)As: from paramagnetic through superparamagnetic to ferromagnetic phase
• All-wurtzite (In,Ga)As-(Ga,Mn)As core-shell nanowires grown by molecular beam epitaxy
• Theory of spin waves in ferromagnetic (Ga,Mn)As
• Interplay between localization and magnetism in (Ga,Mn)As and (In,Mn)As
• Impact of substrate temperature on magnetic properties of plasma-assisted molecular beam epitaxy grown (Ga,Mn)N
• An extensive comparison of anisotropies in MBE grown (Ga,Mn)As material
• Thickness dependence of magnetic properties of (Ga,Mn)As
• Wurtzite (Ga,Mn)As nanowire shells with ferromagnetic properties
• Effect of inversion asymmetry on the intrinsic anomalous Hall effect in ferromagnetic (Ga,Mn)As
• Energetic, electronic and magnetic properties of Mn-dimers on reconstructed (001) GaAs surfaces
• Electronic phase separation in insulating (Ga,Mn)As with low compensation: Super-paramagnetism and hopping conduction

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