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

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

中国物理B ›› 2013, Vol. 22 ›› Issue (11): 117313-117313.doi: 10.1088/1674-1056/22/11/117313

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

林玲芳, 黄欣, 董帅

Department of Physics, Southeast University, Nanjing 211189, China

收稿日期:2013-04-07 修回日期:2013-05-09 出版日期:2013-09-28 发布日期:2013-09-28
基金资助:
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).

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

Lin Ling-Fang (林玲芳), Huang Xin (黄欣), Dong Shuai (董帅)

Department of Physics, Southeast University, Nanjing 211189, China

Received:2013-04-07 Revised:2013-05-09 Online:2013-09-28 Published:2013-09-28
Contact: Dong Shuai E-mail:sdong@seu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: magnetoresistance, resistor–network model, phase competition

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.

Key words: magnetoresistance, resistor–network model, phase competition

中图分类号: (Magnetoresistance)

73.43.Qt

75.10.Hk (Classical spin models) 75.40.Mg (Numerical simulation studies)

林玲芳, 黄欣, 董帅. Simulation of the magnetoresistance of Heisenberg spin lattices using the resistor–network model[J]. 中国物理B, 2013, 22(11): 117313-117313.

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[J]. Chin. Phys. B, 2013, 22(11): 117313-117313.

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

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

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