Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session J40: Magnetic Spin Textures
3:00 PM–6:00 PM,
Tuesday, March 16, 2021
Sponsoring
Units:
GMAG DMP
Chair: Lazar Kish, University of Illinois at Urbana-Champaign
Abstract: J40.00010 : Microscopic magnetic Hamiltonian for exotic spin textures in metals*
4:48 PM–5:00 PM
Live
Presenter:
Deepak Kathyat
(IISER Mohali)
Authors:
Deepak Kathyat
(IISER Mohali)
Arnob Mukherjee
(IISER Mohali)
Sanjeev Kumar
(IISER Mohali)
The Hamiltonian consists of anisotropic interactions of the Dzyaloshinskii-Moriya and pseudodipolar form,
in addition to the standard isotropic term. We validate the spin Hamiltonian by comparing results with those
on the exact spin-fermion model, and present its phase diagram using large-scale Monte Carlo simulations. In
addition to ferromagnetic, planar spiral, and flux states, the model hosts skyrmion crystal and classical spin-liquid
states characterized, respectively, by multiple peaks and a diffuse ring pattern in the spin-structure factor. The
filamentary domain-wall structures in the spin-liquid state are in remarkable agreement with experimental data
on thin films of MnSi-type B20 metals and transition metals and their alloys.
*We acknowledge IISER Mohali computing facility.
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