Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Spin Textures and magnetic Phase Transitions
MA 5.7: Vortrag
Montag, 7. März 2016, 11:30–11:45, H34
Tunable magnetic phase transitions in ultrathin films — •Levente Rózsa1,2, László Udvardi1, László Szunyogh1, and István A. Szabó3 — 1Budapest University of Technology and Economics, Budapest, Hungary — 2Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary — 3University of Debrecen, Debrecen, Hungary
The Dzyaloshinsky-Moriya interaction (DMI) between local magnetic moments has a great impact in spintronics applications. In this contribution we present theoretical investigations of the magnetic properties of an Fe monolayer on W and Ta (110) surfaces. We found different types of ground states as a function of the inward relaxation of the Fe layer varied between 10% and 17% with respect to the ideal layer spacing of the substrate. In case of W(110) substrate this is reflected in a reorientation of the easy axis from in-plane to out-of-plane. For Ta(110) a switching appears from the ferromagnetic state to a cycloidal spin spiral state, then to another spin spiral state with larger wave vector and, for even larger relaxations, a rotation of the normal vector of the spin spiral is found. Classical Monte Carlo simulations indicate temperature-induced transitions between the different magnetic phases observed in the Fe/Ta(110) system. Moreover, we use finite-temperature spin wave theory to explain and analyze these phase transitions qualitatively and quantitatively [1].
[1] L. Rózsa, L. Udvardi, L. Szunyogh, I. A. Szabó, Phys. Rev. B 91, 144424 (2015)