Exchange-biased magnetic tunnel junctions with antiferromagnetic epsilon-Mn3Ga

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Kurt H. , Rode K., Tokuc H., Stamenov P., Venkatesan M., Coey J. M. D.

APPLIED PHYSICS LETTERS, cilt.101, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 101 Konu: 23
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1063/1.4768941
  • Dergi Adı: APPLIED PHYSICS LETTERS

Özet

Oriented c-axis films of the hexagonal triangular antiferromagnetic epsilon-Mn3Ga have been used in bottom-pinned synthetic antiferromagnet magnetic tunnel junctions with MgO barriers, which show up to 150% tunneling magnetoresistance at room temperature. Exchange bias fields as high as 150mT can be achieved for samples field-cooled from 100 degrees C. Thin films of the antiferromagnet have a Neel temperature in excess of 650K and provide an interface exchange energy with CoFe of 0.09 mJ m(-2). They show an isotropic uncompensated magnetization of M-s = 48 kA m(-1), with a coercivity mu H-0(c) > 3T. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4768941]