Role of interparticle coupling on the tunneling magnetoresistance of granular films in interacting superparamagnetic system

被引：2

作者：

Mao, Zhongquan ^{[1
]}

Chen, Dihu ^{[1
]}

He, Zhenhui ^{[1
]}

机构：

[1] Sun Yet Sen Univ, Sch Phys & Engn, Dept Phys, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 05期

基金：

中国国家自然科学基金;

关键词：

tunneling magnetoresistance; interaction; superparamagnetism; magnetization; correlation length;

D O I：

10.1016/j.jmmm.2007.07.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A phenomenological model is employed to explain the departure of H/T scaling of tunneling magnetoresistance (TMR) in Co-0.43(ZrO2)(0.57) granular films (see [B.J. Hattink, M. Garcia del Muro, Z. Konstantinovic, X. Batlle, A. Labarta, Phys. Rev. B 73 (2006) 045418]). The model bases on the modi. cation of Langevin function by taking into account the field-dependent correlation length, in the framework of Inoue-Maekawa model. Both TMR-H and TMR-H/T curves can be reproduced very well by this model, indicating that the interparticle coupling plays an important role on TMR in the interacting superparamagnetic systems. The influence of anisotropy and spin polarization of the magnetic particles on TMR-H/T curves is also discussed. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：642 / 645

页数：4

共 50 条

[21] Magnetic properties and tunneling magnetoresistance in FeCo-SiO2 granular films
XI Li
Chinese Science Bulletin, 2001, (09) : 734 - 737
[22] Tunneling giant magnetoresistance in heterogeneous Fe-SiO2 granular films
Honda, S
Okada, T
Nawate, M
Tokumoto, M
PHYSICAL REVIEW B, 1997, 56 (22): : 14566 - 14573
[23] Magnetic properties and tunneling magnetoresistance effect in Fe-CdFeS granular films
Liu, K. W.
Zhang, J. Y.
Shen, D. Z.
Wu, X. J.
Li, B. H.
Li, B. S.
Lu, Y. M.
Fan, X. W.
APPLIED PHYSICS LETTERS, 2007, 90 (09)
[24] Effect of network on tunneling magnetoresistance in a half-metallic granular system
Zhou, LP
Ju, S
Li, ZY
JOURNAL OF APPLIED PHYSICS, 2004, 95 (12) : 8041 - 8045
[25] Nanoparticle morphology in FeCo-SiO2 granular films with tunneling giant magnetoresistance
Wang, Changzheng
Xiao, Xiaoguang
Rong, Yonghua
Hsu, H. Y.
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2007, 141 (03): : 126 - 131
[26] Tunneling giant magnetoresistance in Fe-Al2O3 granular films
Zhu, T
Wang, YJ
ACTA PHYSICA SINICA, 1999, 48 (04) : 763 - 768
[27] Magnetic properties and the tunneling magnetoresistance effect in Co-MgF2 granular films
Chi, JH
Ge, SH
Liu, CM
Kunkel, HP
Zhou, XZ
Williams, G
JOURNAL OF APPLIED PHYSICS, 2003, 93 (10) : 6188 - 6191
[28] Effect of transport channels on tunneling magnetoresistance in half-metallic granular system
Zhou, LP
Ju, S
Li, ZY
PHYSICS LETTERS A, 2004, 329 (1-2) : 60 - 67
[29] Mossbauer studies of Fe-Pb-O granular films with enhanced tunneling magnetoresistance effect
Hsu, JH
Huang, YH
IEEE TRANSACTIONS ON MAGNETICS, 1998, 34 (04) : 909 - 911
[30] Tunneling magnetoresistance and electron spin resonance study on Co-Al-O granular films
Lin, JG
Tang, SY
Hsu, WD
Kuo, PC
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 239 (1-3) : 154 - 156

← 1 2 3 4 5 →