13:30 〜 15:30
[9p-PB1-27] Strain mediated magnetic properties in thin Fe4N pseudo single-crystal films
キーワード：Nitride、Fe4N、magnetic anisotropy
For future spintronic devices with various functionalities, Fe based nitrides such as Fe4N has been considered one of the key materials because of its negative and 100% spin polarization of the conduction electron. However, in ultra-thin Fe4N films, e.g. less than 3 nm, influences from lattice strain and/or misfit dislocations at stacking interfaces might be tangible. In this study, such the effects on magnetic properties of Fe4N were quantified using the specimen fabricated on the different substrates.
15-nm-thick Fe4N films were fabicated using DC and RF reactive nitride sputtering technique on the three different MgO, MgAl2O4 and SrTiO3 substrates.Note that lattice mismatch with the Fe4N film were ~9.5%, ~5.6% and ~2.2%, respectively.
XRD rocking curves of Fe4N (002) planes were measured. As a result, sharp and broad mixture peaks were observed, indicating the presence of two different crystallographic phases. The phase separation was remarkable for MAO and STO, whereas negligible for MgO. The mechanisms behind will be discussed based on the thickness dependence, and related magnetic anisotropy will be shown at the conference.
15-nm-thick Fe4N films were fabicated using DC and RF reactive nitride sputtering technique on the three different MgO, MgAl2O4 and SrTiO3 substrates.Note that lattice mismatch with the Fe4N film were ~9.5%, ~5.6% and ~2.2%, respectively.
XRD rocking curves of Fe4N (002) planes were measured. As a result, sharp and broad mixture peaks were observed, indicating the presence of two different crystallographic phases. The phase separation was remarkable for MAO and STO, whereas negligible for MgO. The mechanisms behind will be discussed based on the thickness dependence, and related magnetic anisotropy will be shown at the conference.