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Impact of interface crystallization on inelastic tunneling in AlAl Ox CoFeB

Applied Physics Letters, ISSN: 0003-6951, Vol: 91, Issue: 22
2007
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We report the change in inelastic electron tunneling spectra (IETS) for AlAl Ox CoFeBAl junctions when the structure of CoFeB at its interface with Al Ox is intentionally changed from quasiamorphous to highly textured fcc. While for the quasiamorphous interface there are signs of the size quantization of magnons, the spectra for the fcc interface show distinct excitations at bias voltages associated with known surface magnon modes in fcc Co. These results demonstrate that IETS can be used as a tool to probe distinct structural changes of the magnetic electrode in tunnel junctions. © 2007 American Institute of Physics.

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