Simulation of the magnetoresistance of Heisenberg spin lattices using the resistor–network model

doi:10.1088/1674-1056/22/11/117313

Abstract The magnetism and conductance of two-dimensional Heisenberg spin lattices are investigated by using Monte Carlo simulations to qualitatively understand a fascinating magnetoresistance effect observed in magnetic materials and their artificial multilayers. Various magnetic profiles, including a pure ferromagnetic, a pure antiferromagnetic, two phase competitive cases, and an artificial sandwich junction, are simulated, and their conductances are calculated based on an extended resistor–network model. Magnetoresistance is observed in some lattices, which is prominent when the system is near phase boundaries. Compared with real manganites, the absence of colossal magnetoresistance in our simulation implies the essential role of charge ordered phase which is not included in our pure spin model. However, our model provides an intuitive understanding of the spin-dependent conductance in large scale.

Keywords: magnetoresistance resistor–network model phase competition

Received: 07 April 2013
Revised: 09 May 2013
Accepted manuscript online:

PACS:	73.43.Qt	(Magnetoresistance)
	75.10.Hk	(Classical spin models)
	75.40.Mg	(Numerical simulation studies)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11004027), the New Century Excellent Talents in University of China (Grant No. 10-0325), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20100092120032), and the National Student Research Training Program (Grant No. 1310286044).

Corresponding Authors: Dong Shuai
E-mail: sdong@seu.edu.cn

Cite this article:

Lin Ling-Fang (林玲芳), Huang Xin (黄欣), Dong Shuai (董帅) Simulation of the magnetoresistance of Heisenberg spin lattices using the resistor–network model 2013 Chin. Phys. B 22 117313

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Simulation of the magnetoresistance of Heisenberg spin lattices using the resistor–network model

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