Manipulation of saturation magnetization and perpendicular magnetic anisotropy in epitaxial C ox M n4-x N films with ferrimagnetic compensation

Keita Ito, Yoko Yasutomi, Siyuan Zhu, Munisa Nurmamat, Masaki Tahara, Kaoru Toko, Ryota Akiyama, Yukiharu Takeda, Yuji Saitoh, Tamio Oguchi, Akio Kimura, Takashi Suemasu

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Abstract

Spintronics devices utilizing a magnetic domain-wall motion have attracted increasing attention, and ferrimagnetic materials with almost-compensated magnetic moments are highly required to realize the fast magnetic domain-wall motion. Here, we report a key function for this purpose in the antiperovskite CoxMn4-xN film. We have grown CoxMn4-xN films with various Co/Mn ratios on SrTiO3(001) by molecular-beam epitaxy. High-quality growth is confirmed and a perpendicular magnetization emerges at x=0, 0.2, 0.5, and 0.8, whereas it turns into in plane for x≥1.1. The saturation magnetization MS decreases as x increases and reaches a minimum value of 15emu/cm3 at x=0.8. Then, it increases with x when 0.8≤x≤3.6 and saturates. These results indicate that MS and magnetic anisotropy of CoxMn4-xN films can be manipulated by the Co composition. X-ray absorption spectroscopy and magnetic circular dichroism measurements revealed that Co atoms tend to occupy the I site in the antiperovskite lattice and reasonably explains the origin of minimum MS near x=0.8, where a compensation of magnetic moments occurs among different atomic sites. We consider that the nearly compensated ferrimagnetic Co0.8Mn3.2N is suitable for application to current-induced domain-wall motion devices.

Original languageEnglish
Article number104401
JournalPhysical Review B
Volume101
Issue number10
DOIs
Publication statusPublished - 2020 Mar 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Ito, K., Yasutomi, Y., Zhu, S., Nurmamat, M., Tahara, M., Toko, K., Akiyama, R., Takeda, Y., Saitoh, Y., Oguchi, T., Kimura, A., & Suemasu, T. (2020). Manipulation of saturation magnetization and perpendicular magnetic anisotropy in epitaxial C ox M n4-x N films with ferrimagnetic compensation. Physical Review B, 101(10), [104401]. https://doi.org/10.1103/PhysRevB.101.104401