Volume-dependent exchange interactions and noncollinear magnetism in zinc-blende MnAs
2006 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 18, 184401- p.Article in journal (Refereed) Published
We have studied magnetic interactions in zinc-blende MnAs as a function of volume by ab initio density-functional calculations. The calculated Heisenberg pair-exchange parameters show a strong volume dependence. The calculated Curie temperatures, obtained by Monte Carlo simulations using ab initio parameters and a classical Heisenberg Hamiltonian, show a decreasing trend upon compression. Analysis of cross sections of Fermi surfaces indicate a nesting feature for compressed volumes, which can give rise to competing exchange interactions. Calculations of self-consistent noncollinear spin configurations indicate that spins deviate strongly from collinear ordering for low volumes whereas they align in a collinear ferromagnetic fashion for high volumes. Also, for expanded volumes, the calculated Curie temperature is around 600 K signifying the possibility of using MnAs for future room-temperature spintronic applications.
Place, publisher, year, edition, pages
2006. Vol. 74, no 18, 184401- p.
spintronics, magnetism, exchange interaction, Monte-Carlo simulation
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-83552DOI: 10.1103/PhysRevB.74.184401ISI: 000242409100047OAI: oai:DiVA.org:uu-83552DiVA: diva2:111460