Boron diffusion in magnetic tunnel junctions with MgO (001) barriers and CoFeB electrodes


Creative Commons License

Kurt H. , Rode K., Oğuz K., Boese M., Faulkner C. C. , Coey J. M. D.

APPLIED PHYSICS LETTERS, cilt.96, 2010 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 96 Konu: 26
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1063/1.3457475
  • Dergi Adı: APPLIED PHYSICS LETTERS

Özet

Boron diffusion out of the CoFeB layers in model systems with thick CoFeB and MgO layers grown by radiofrequency sputtering or electron-beam evaporation and in MgO-based magnetic tunnel junctions (MTJs) is probed after annealing by x-ray photoemission spectroscopy (XPS) and electron energy loss spectroscopy. Successive interfaces are exposed by ion milling the stacks, layer by layer, in the XPS system. Despite the presence of thick CoFeB and a high annealing temperature of 400 degrees C, we found no boron in the MgO or at the MgO/CoFe interfaces. Similar results are also obtained in the MTJs. (C) 2010 American Institute of Physics. [doi:10.1063/1.3457475]