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27 April 2024 |
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Magnetic Anisotropy, Spin Pinning and Exchange Constants of (Ga,Mn)As films | | Ying-Yuan Zhou
; Yong-Jin Cho
; Zhiguo Ge
; Xinyu Liu
; Malgorzata Dobrowolska
; Jacek K. Furdyna
; | | Date: |
29 Jan 2007 | | Subject: | Materials Science | | Abstract: | We present a detailed investigation of exchange-dominated nonpropagating spin-wave modes in a series of 100 nm Ga$_{1 - x}$Mn$_{x}$As films with Mn concentrations $x$ ranging from 0.02 to 0.08. The angular and Mn concentration dependences of spin wave resonance modes have been studied for both as-grown and annealed samples. Our results indicate that the magnetic anisotropy terms of Ga$_{1 - x}$Mn$_{x}$As depend on the Mn concentration $x$, but are also strongly affected by sample growth conditions; moreover, the magnetic anisotropy of Ga$_{1 - x}$Mn$_{x}$As films is found to be clearly linked to the Curie temperature. The spin wave resonance spectra consist of a series of well resolved standing spin-wave modes. The observed mode patterns are consistent with the Portis volume-inhomogeneity model, in which a spatially nonuniform anisotropy field acts on the Mn spins. The analysis of these exchange-dominated spin wave modes, including their angular dependences, allows us to establish the exchange stiffness constants for Ga$_{1 - x}$Mn$_{x}$As films. | | Source: | arXiv, cond-mat/0701717 | | Services: | Forum | Review | PDF | Favorites | |
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