[10a-M101-1~8] 10.1 新物質・新機能創成（作製・評価技術）

▲ [10a-M101-7] Enhanced effective damping constant in Mn based nitride compounds

〇Shinji Isogami¹、Akihito Anzai²、Toshiki Gushi²、Taro Komori²、Yukiko Takahashi¹、Takashi Suemasu² (1.NIMS、2.Tsukuba Univ.)

キーワード：Nitride, Damping constant, TR-MOKE

Effective damping constant (a_eff) of Mn based nitrides such as Fe_4−xMn_xN (x = 0, 1, 2, and 4) pseudo single-crystal films were investigated by using both conventional ESR systems and pump-probe method of TR-MOKE at room temperature. As a result, the a_eff ~ 0.03 was obtained for the x = 0 (Fe₄N), which agreed with the previous value. And decreased down to 0.01 for the x = 1, then monotonic increase was observed up to the x = 4. Possible mechanisms will be discussed at the conference, but note that a_eff ~ 0.15 for the x = 4 was two orders of magnitude higher compared with the other Mn based metallic alloy systems such as MnGa.