Symmetry-state features in a global analysis of the temperature-dependent spin transport in Fe/MgO/Fe junctions

被引：3
作者：
Bellouard, C. [1 ]
Lu, Y. [1 ]
Duluard, A. [1 ]
Negulescu, B. [2 ]
Senet, C. [1 ]
Maloufi, N. [3 ]
Hehn, M. [1 ]
Tiusan, C. [4 ,5 ]
机构：
[1] Univ Lorraine, CNRS, Inst Jean Lamour, UMR 7198, Campus Artem,2 Allee Andre Guinier, F-54011 Nancy, France
[2] Univ Tours, UFR Sci & Tech, Grp Rech Mat Microelect Acoust & Nanotechnol, Parc Grandmont,Batiment E, F-37200 Tours, France
[3] Univ Lorraine, Lab Etud Microstruct & Mecan Mat LEM3, UMR 7239, F-57045 Metz 1, France
[4] Tech Univ Cluj Napoca, Ctr Superconduct Spintron & Surface Sci, Str Memorandumului 28, RO-400114 Cluj Napoca, Romania
[5] CNRS, DGDR, DR06, Paris, France
来源：
PHYSICAL REVIEW B | 2018年 / 98卷 / 14期
基金：
中国国家自然科学基金;
关键词：
MAGNETIC TUNNEL-JUNCTIONS; ROOM-TEMPERATURE; MAGNETORESISTANCE;
D O I：
10.1103/PhysRevB.98.144437
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The temperature dependence of the spin polarized tunnel conductance is investigated with Fe/MgO/Fe tunnel junctions with different structural properties and interfacial chemistry. A global quantitative model is proposed for analyzing the tunnel conductance in both parallel and antiparallel configuration. Three contributions to the temperature dependence can be distinguished. The first one is governed by the Bloch law for the temperature dependence of the magnetization of the electrodes. The second one is unpolarized and follows a power-law associated with a hopping mechanism. Although these two mechanisms are predominant in the decrease of tunnel magnetoresistance with temperature, a third contribution must be considered. This term results from a thermally activated decrease of the effective spin polarization, introduced by an Arrhenius law. It appears in either the parallel or antiparallel conductance, depending on the interface chemical doping, and could then be related to a symmetry dependent diffusion process. Finally, this global analysis appears universal, as it can well fit the temperature dependence of all samples.
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页数：8
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