Low magnetisation alloys for in-plane spin transfer torque devices

被引：15
|
作者：
Oguz, K. [1 ,2 ]
Ozdemir, M. [3 ]
Dur, O. [4 ]
Coey, J. M. D. [1 ,2 ]
机构：
[1] Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland
[2] Trinity Coll Dublin, CRANN, Dublin 2, Ireland
[3] Marmara Univ, Fac Sci, Dept Phys, Istanbul, Turkey
[4] Zincirlikuyu, Energy Informat & Commun Grp, Calik Holding, Istanbul, Turkey
来源：
JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 11期
关键词：
MULTILAYER; EXCITATION;
D O I：
10.1063/1.4723824
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetic properties of thin films of three in-plane alloy systems, namely, Co40Ni40-xCrxB20, Co40Fe40-xNixB20, and Co40Fe40-xCrxB20 are investigated with a view to reducing the critical current density (j(c)) for spin transfer torque switching in MgO barrier magnetic tunnel junction nanopillars. In all three systems, the saturation magnetisation, M-s, decreases with increasing Cr or Ni substitution. The Co40Fe40-xCrxB20 alloy system is found to be the best in terms of reducing Ms, while maintaining a high tunnel magnetoresistance ratio. Ferromagnetic resonance experiments revealed that the damping coefficient of CoFeCrB alloy remains unchanged with increasing Cr content, but jc is reduced by a factor of four to 4.9 x 10(5) A/cm(2) by using a Co40Fe32.7Cr7.3B20 free layer while maintaining a magnetoresistance of around 60 %. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4723824]
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页数：6
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