Comparison of laser-induced and intrinsic tunnel magneto-Seebeck effect in CoFeB/MgAl2O4 and CoFeB/MgO magnetic tunnel junctions

被引：29

作者：

Huebner, Torsten ^{[1
]}

Boehnke, Alexander ^{[1
]}

Martens, Ulrike ^{[2
]}

Thomas, Andy ^{[3
]}

Schmalhorst, Jan-Michael ^{[1
]}

Reiss, Guenter ^{[1
]}

Muenzenberg, Markus ^{[2
]}

Kuschel, Timo ^{[1
,4
]}

机构：

[1] Univ Bielefeld, Dept Phys, Ctr Spinelect Mat & Devices, Univ Str 25, D-33615 Bielefeld, Germany

[2] Ernst Moritz Arndt Univ Greifswald, Inst Phys, Felix Hausdorff Str 6, D-17489 Greifswald, Germany

[3] Inst Met Mat, Leibniz Inst Solid State & Mat Res Dresden IFW Dr, Helmholtzstr 20, D-01069 Dresden, Germany

[4] Univ Groningen, Zernike Inst Adv Mat, Phys Nanodevices, Nijenborgh 4, NL-9747 AG Groningen, Netherlands

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 22期

关键词：

THERMAL-CONDUCTIVITY; MGAL2O4;

D O I：

10.1103/PhysRevB.93.224433

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a comparison of the tunnel magneto-Seebeck effect for laser-induced and intrinsic heating. Therefore, Co40Fe40B20/MgAl2O4 and Co25Fe55B20/MgO magnetic tunnel junctions have been prepared. The TMS ratio of 3% in case of the MAO MTJ agrees well with ratios found for other barrier materials, while the TMS ratio of 23% of the MgO MTJ emphasizes the influence of the CoFe composition. We find results using the intrinsic method that differ in sign and magnitude in comparison to the results of the laser heating. The intrinsic contributions can alternatively be explained by the Brinkman model and the given junction properties. Especially, we are able to demonstrate that the symmetric contribution is solely influenced by the barrier asymmetry. Thus, we conclude that the symmetry analysis used for the intrinsic method is not suitable to unambiguously identify an intrinsic tunnel magneto-Seebeck effect.

引用

页数：6

共 31 条

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