Atomistic spin dynamics of the Cu-Mn spin-glass alloy
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, no 2, 024411- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2009. Vol. 79, no 2, 024411- p.
copper alloys, damping, density functional theory, Heisenberg model, manganese alloys, spin dynamics, spin glasses
IdentifiersURN: urn:nbn:se:kth:diva-32687DOI: 10.1103/PhysRevB.79.024411ISI: 000262978100056ScopusID: 2-s2.0-59249107369OAI: oai:DiVA.org:kth-32687DiVA: diva2:411423
FunderSwedish Research Council
QC 201104182011-04-182011-04-182011-04-18Bibliographically approved