@article{oai:repo.qst.go.jp:00086161,
 author = {Suto, Hirofumi and Nakatani, Tomoya and Kota, Yohei and Nagarjuna, Asam and Iwasaki, Hitoshi and Amemiya, Kenta and Mitsui, Takaya and Sakai, Seiji and Li, Songtian and Kota, Yohei and Sakuraba, Yuya and Takaya, Mitsui and Seiji, Sakai and Songtian, Li},
 journal = {Journal of Magnetism and Magnetic Materials},
 month = {Sep},
 note = {Negative-spin-polarization material generates a spin current whose spin direction is opposite to the magnetization direction. This characteristicis technologically important because it can increase the freedom in the designof spintronic devices. In this paper, westudied FeCr from the viewpoints of the band structure, atomic magnetic moments, and local atomic arrangementto explore the potentiality as a negative-spin-polarization material. Thefirst-principlescalculation on the disordered FeCr alloypredicted a high negative spin polarization, whichis attributed to the band matching of the minority spin.We experimentally fabricated Fe1-xCrxthin film in the Cr-concentration (x) range from 0.2 to 0.4 by sputter deposition. The spin polarization of Fe0.7Cr0.3 estimated from current-perpendicular-to-plane giant magnetoresistance was −0.28 and fell below the calculated value. The synchrotron X-ray magnetic circular dichroism (XMCD)measurement showed the ferrimagnetic configuration of the magnetic moments of Fe and Cr. The Fe moment shows a large moment over the wide Cr concentration range, whereas the Cr moment decreased with the Cr concentration, which agrees with the calculation result. The synchrotron Mössbauer spectroscopy measurement indicated the inhomogeneity of the FeCr composition even in the as-deposited state. It was also found that Fe-rich region was formed after annealing, reflecting the phase separation nature of the FeCr system.The inhomogeneity was not considered in the calculation and could be the origin of the low spin polarization observed in the experiment.},
 pages = {169474-1--169474-9},
 title = {Study on FeCr thin film for a spintronic material with negative spin polarization},
 volume = {557},
 year = {2022}
}