Spin polarization of Fe4N thin films determined by point-contact Andreev reflection

Narahara, A.; Ito, K.; Suemasu, T.; Takahashi, Y. K.; Ranajikanth, A.; Hono, K.
May 2009
Applied Physics Letters;5/18/2009, Vol. 94 Issue 20, p202502
Academic Journal
The spin polarization of (100)-oriented γ′-Fe4N layers grown on MgO(001) substrates by molecular beam epitaxy was deduced from point contact Andreev reflection measurements, and the value was compared with that of α-Fe. The spin polarization (P) for γ′-Fe4N is approximately 0.59 at 7.8 K. This value is distinctly larger than that for α-Fe (P=0.49 at 7.8 K) measured with an identical setting. The mechanism of enhanced spin polarization in γ′-Fe4N is discussed.


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