Atomistic spin dynamics of the Cu-Mn spin-glass alloy

被引：11

作者：

Skubic, B. ^{[1
]}

Peil, O. E. ^{[1
,2
]}

Hellsvik, J. ^{[1
]}

Nordblad, P. ^{[3
]}

Nordstrom, L. ^{[1
]}

Eriksson, O. ^{[1
]}

机构：

[1] Uppsala Univ, Dept Phys & Mat Sci, SE-75121 Uppsala, Sweden

[2] KTH, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden

[3] Uppsala Univ, Dept Engn Sci, SE-75121 Uppsala, Sweden

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 02期

基金：

瑞典研究理事会;

关键词：

copper alloys; damping; density functional theory; Heisenberg model; manganese alloys; spin dynamics; spin glasses; NONEQUILIBRIUM DYNAMICS; MONTE-CARLO; EQUILIBRIUM; RELAXATION; TRANSITION; SIMULATION; RESONANCE; SYSTEMS; MODELS;

D O I：

10.1103/PhysRevB.79.024411

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate the use of Langevin spin dynamics for studying dynamical properties of an archetypical spin-glass system. Simulations are performed on CuMn (20% Mn) where we study the relaxation that follows a sudden quench of the system to the low-temperature phase. The system is modeled by a Heisenberg Hamiltonian where the Heisenberg interaction parameters are calculated by means of first-principles density-functional theory. Simulations are performed by numerically solving the Langevin equations of motion for the atomic spins. It is shown that dynamics is governed, to a large degree, by the damping parameter in the equations of motion and the system size. For large damping and large system sizes, we observe the typical aging regime.

引用

页数：7

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