Wide modulation of coercive fields in Mn4N ferrimagnetic thin films caused dominantly by dislocation microstructures

Shinji Isogami; Mitsuru Ohtake; Yusuke Kozuka; Yukiko K. Takahashi

doi:10.1016/j.jmmm.2022.169642

論文 Wide modulation of coercive fields in Mn4N ferrimagnetic thin films caused dominantly by dislocation microstructures

Shinji Isogami (National Institute for Materials Science) ; Mitsuru Ohtake ; Yusuke Kozuka (National Institute for Materials Science) ; Yukiko K. Takahashi (National Institute for Materials Science)

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Shinji Isogami, Mitsuru Ohtake, Yusuke Kozuka, Yukiko K. Takahashi. Wide modulation of coercive fields in Mn4N ferrimagnetic thin films caused dominantly by dislocation microstructures. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. 2022, 560 (), 169642. https://doi.org/10.1016/j.jmmm.2022.169642

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(abstract)

Mn4N films with a maximum degree of order of nitrogen (S) were fabricated under three different substrate temperatures (Tsub), and the dominant factors were investigated for tuning the magnetic coercivity (Hc) in the films. It was revealed that Hc was strongly modulated from 10 kOe to 7.5 kOe for Tsub from 400 to 500 degree C, whereas the S, perpendicular magnetic anisotropy (PMA), and transport properties did not change. The number of dislocations and in-plane grain size (D) increased, whereas the residual strain decreased with increasing Tsub. Thus, we concluded that the Hc of the Mn4N film with maximum S is sensitive to the variation in dislocations, which are modulated by Tsub. Because Hc is linked to thermal stability and working power consumption, tunable Hc is an attractive phenomenon from the perspective of magnetic and spintronic devices using ferrimagnetic Mn4N films with high PMA and low saturation magnetization.

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