Phase diagram of dipolar-coupled XY moments on disordered square lattices

The effects of dilution disorder and random-displacement disorder are analyzed for dipolar-coupled magnetic moments confined in a plane, which were originally placed on the square lattice. In order to distinguish the different phases, new order parameters are derived and parallel tempering Monte Car...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B 2018-08, Vol.98 (6), p.064420, Article 064420
Main Authors: Schildknecht, Dominik, Heyderman, Laura J., Derlet, Peter M.
Format: Article
Language:English
Subjects:
Computer simulation
Dilution
Lattices
Magnetic moments
Monte Carlo simulation
Order parameters
Phase diagrams
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effects of dilution disorder and random-displacement disorder are analyzed for dipolar-coupled magnetic moments confined in a plane, which were originally placed on the square lattice. In order to distinguish the different phases, new order parameters are derived and parallel tempering Monte Carlo simulations are performed for a truncated dipolar Hamiltonian to obtain the phase diagrams for both types of disorder. We find that both dilution disorder and random-displacement disorder give similar phase diagrams, namely, disorder at small enough temperatures favors a so-called microvortex phase. This can be understood in terms of the flux closure present in dipolar-coupled systems.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.064420