Low magnetisation alloys for in-plane spin transfer torque devices
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2012Access:
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Oguz, K, Ozdemir, M, Dur, O, Coey, JMD, Low magnetisation alloys for in-plane spin transfer torque devices, Journal of Applied Physics, 111, 2012, 113904-Download Item:
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Abstract:
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 (jc ) for spin transfertorque switching in MgO barrier magnetic tunnel junction nanopillars. In all three systems, the saturation magnetisation, Ms , 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???105?A/cm2 by using a Co40Fe32.7Cr7.3B20 free layer while maintaining a magnetoresistance of around 60 %
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Science Foundation Ireland (SFI)
05/IN/1850.
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http://people.tcd.ie/jcoeyhttp://people.tcd.ie/koguz
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Author: COEY, JOHN; OGUZ, KAAN
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Journal of Applied Physics111
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http://dx.doi.org/10.1063/1.4723824Licences: