Quantum transport in a ferromagnetic nanowire: conductance and MR effect

被引：5

作者：

Dartora, CA ^{[1
]}

Cabrera, GG ^{[1
]}

机构：

[1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

来源：

PHYSICS LETTERS A | 2005年 / 334卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

giant magnetoresistance; nanowire;

D O I：

10.1016/j.physleta.2004.11.032

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter we analyze the general features of quantum transport in a ferromagnetic nanowire based on a simple model. The local spin distribution, provided by well localized d-electrons, is governed by the Heisenberg-Ising ferromagnetic Hamiltonian while for the s-like conduction electron we have considered the Anderson model. The interaction between local spin and itinerant electrons is given by H-I = -DeltaSigma(i)S(i) (.) sigmadelta(x - x(i)). The conductance formulae and the giant magnetoresistance effect for a nanowire placed between two ferromagnetic electrodes are obtained. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：46 / 54

页数：9

共 27 条

[1] Magnon-assisted inelastic excitation spectra of a ferromagnetic tunnel junction [J].

Ando, Y ;

Murai, J ;

Kubota, H ;

Miyazaki, T .

JOURNAL OF APPLIED PHYSICS, 2000, 87 (09) :5209-5211

[2] Low voltage I-V characteristics in magnetic tunneling junctions [J].

Cabrera, GG ;

García, N .

APPLIED PHYSICS LETTERS, 2002, 80 (10) :1782-1784

[3] THEORY OF RESIDUAL RESISTIVITY OF BLOCH WALLS .1. PARAMAGNETIC EFFECTS [J].

CABRERA, GG ;

FALICOV, LM .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1974, 61 (02) :539-549

[4] Ballistic magnetoresistance over 3000% in Ni nanocontacts at room temperature [J].

Chopra, HD ;

Hua, SZ .

PHYSICAL REVIEW B, 2002, 66 (02) :1-3

[5] Ferromagnetic tunneling junctions at low voltages:: Elastic versus inelastic scattering at T=0 °K [J].

Dartora, CA ;

Cabrera, GG .

JOURNAL OF APPLIED PHYSICS, 2004, 95 (11) :6058-6064

[6] Electrons in a ferromagnetic metal with a domain wall [J].

Dugaev, VK ;

Barnas, J ;

Lusakowski, A ;

Turski, LA .

PHYSICAL REVIEW B, 2002, 65 (22) :2244191-2244199

[7]

Ferry DK, 1997, TRANSPORT NANOSTRUCT

[8] Ballistic magnetoresistance in transition-metal nanocontacts:: The case of iron [J].

García, N ;

Muñoz, M ;

Zhao, YW .

APPLIED PHYSICS LETTERS, 2000, 76 (18) :2586-2587

[9] Magnetoresistance in excess of 200% in ballistic Ni nanocontacts at room temperature and 100 Oe [J].

García, N ;

Muñoz, M ;

Zhao, YW .

PHYSICAL REVIEW LETTERS, 1999, 82 (14) :2923-2926

[10]

Imry Y., 1997, INTRO MESOSCOPIC PHY

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