Deposition and spin polarization study of Fe4N thin films with (111) orientation

Deposition and spin polarization study of Fe4N thin films with (111) orientation

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We have successfully deposited Fe4N thin films with (111) out-of-plane orientation on thermally oxidized Si substrates using a facing-target-sputtering system.A Ta/Ru composite buffer layer was adopted to improve the (111) orientation of the Fe4N thin films.The N2 partial pressure and substrate temperature click here during sputtering were optimized to promote the formation of the Fe4N phase.

Furthermore, we measured the transport spin polarization of (111) oriented Fe4N by the point contact Andreev reflection (PCAR) technique.The spin polarization ratio was determined to be 0.50 using a modified BTK model.

The film thickness dependence of the spin polarization was also investigated.The spin polarization of Fe4N measured by PCAR does not show degradation as the sample thickness was reduced moondrop quarks to 10nm.