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Spatially homogeneous ferromagnetism of (Ga, Mn)As.

Content Provider	Semantic Scholar
Author	Dunsiger, Sarah Ruth Carlo, Jeremy P. Goko, Tatsuo Nieuwenhuys, Gerard Prokscha, Thomas Suter, Andreas Morenzoni, Elvezio Chiba, Daichi Nishitani, Y. Tanikawa, Takehiro Matsukura, Fumihiro Ohno, Hideo Ohe, Jun-Ichiro Maekawa, Sadamichi Uemura, Yasutomo J.
Copyright Year	2010
Abstract	Mn-doped GaAs is a ferromagnetic semiconductor, widely studied because of its possible application for spin-sensitive 'spintronics' devices. The material also attracts great interest in fundamental research regarding its evolution from a paramagnetic insulator to a ferromagnetic metal. The high sensitivity of its physical properties to preparation conditions and heat treatments and the strong doping and temperature dependencies of the magnetic anisotropy have generated a view in the research community that ferromagnetism in (Ga, Mn)As may be associated with unavoidable and intrinsic strong spatial inhomogeneity. Muon spin relaxation (muSR) probes magnetism, yielding unique information about the volume fraction of regions having static magnetic order, as well as the size and distribution of the ordered moments. By combining low-energy muSR, conductivity and a.c. and d.c. magnetization results obtained on high-quality thin-film specimens, we demonstrate here that (Ga, Mn)As shows a sharp onset of ferromagnetic order, developing homogeneously in the full volume fraction, in both insulating and metallic films. Smooth evolution of the ordered moment size across the insulator-metal phase boundary indicates strong ferromagnetic coupling between Mn moments that exists before the emergence of fully itinerant hole carriers.
Starting Page	299
Ending Page	303
Page Count	5
File Format	PDF HTM / HTML
DOI	10.1038/nmat2715
PubMed reference number	20305642
Journal	Medline
Volume Number	9
Issue Number	4
Alternate Webpage(s)	https://nrc-publications.canada.ca/eng/view/accepted/?id=af9eecf0-33a3-485c-a7b1-31adcc2f1b50
Alternate Webpage(s)	https://doi.org/10.1038/nmat2715
Journal	Nature materials
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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