Influence of disorder on the ferromagnetism in diluted magnetic semiconductors

Abstract

Influence of disorder on the ferromagnetic phase transition in diluted (III,Mn)V semiconductors is investigated analytically. The regime of small disorder is addressed, and the enhancement of the critical temperature by disorder is found both in the mean field approximation and from the analysis of the zero temperature spin stiffness. Due to disorder, the spin wave fluctuations around the ferromagnetically ordered state acquire a finite mass. At large charge carrier band width, the spin wave mass squared becomes negative, signaling the breakdown of the ferromagnetic ground state and the onset of a noncollinear magnetic order.

Replaced with revised version. 10 pages, 3 figures

References in corpus (5)

• Ferromagnetism in magnetically doped III-V semiconductors
• Theory of Magnetic Properties and Spin-Wave Dispersion for Ferromagnetic (Ga,Mn)As
• Noncollinear Ferromagnetism in (III,Mn)V Semiconductors
• Two-component approach for thermodynamic properties in diluted magnetic semiconductors
• Mean-field theory of magnetic properties of Mn${}_x$III${}_{1-x}$V semiconductors

Cited by in corpus (13)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Disorder effects in diluted magnetic semiconductors
• Monte Carlo simulations of an impurity band model for III-V diluted magnetic semiconductors
• Electronic and magnetic properties of substitutional Mn clusters in (Ga,Mn)As
• Ferromagnetism in (In,Mn)As alloy thin films grown by metalorganic vapor phase epitaxy
• Coercive Field and Magnetization Deficit in Ga(1-x)Mn(x)As Epilayers
• Disorder-induced noncollinear ferromagnetism in models for (III,Mn)V semiconductors
• Ferromagnetism in a dilute magnetic semiconductor -- Generalized RKKY interaction and spin-wave excitations
• Carrier induced ferromagnetism in diluted local-moment systems
• Exchange anisotropy, disorder and frustration in diluted, predominantly ferromagnetic, Heisenberg spin systems
• Spin dynamics in the diluted ferromagnetic Kondo lattice model
• Effects of dilution and disorder on magnetism in diluted spin systems
• RKKY interaction in Mn-doped 4 $\times$ 4 Luttinger systems