TY - GEN
T1 - Tetragonal distortion and perpendicular magnetic anisotropy of FeCo layer in the FePt/ FeCo and FePt/Cu/FeCo films
AU - Wang, B.
AU - Omiya, H.
AU - Hasegawa, T.
AU - Nakamura, T.
AU - Zhang, L.
AU - Liu, L.
AU - Ishio, S.
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/7/14
Y1 - 2015/7/14
N2 - ThThe combination of the large uniaxial magnetocrystalline anisotropy (7×107 erg/cm3) of L10 ordered FePt and the large Ms of FeCo is quite attractive for the practical application to high density magnetic recording media and for developing innovative permanent magnets [1,2]. Moreover, it is predicted by the first-principle calculations that the tetragonal distortion (c/a∼1.25) yields a large uniaxial MAE (700-800 μeV/atom) in FeCo alloys [2, 3]. There are two factors which are important to understand the magnetization process of FePt/FeCo bilayer films: one is the uniaxial magnetic anisotropy induced by a tetragonal distortion at the interface between FePt and FeCo layers and the other is an exchange coupling between two layers. In the present work, the tetragonal distortion in FeCo at the interface between FePt and FeCo layers is observed by XRD and TEM analysis, and the uniaxial magnetic anisotropy is evaluated from the magnetization process of FePt/FeCo and FePt/Cu/FeCo films. Correlation between the tetragonal distortion and magnetic anisotropy is studied.
AB - ThThe combination of the large uniaxial magnetocrystalline anisotropy (7×107 erg/cm3) of L10 ordered FePt and the large Ms of FeCo is quite attractive for the practical application to high density magnetic recording media and for developing innovative permanent magnets [1,2]. Moreover, it is predicted by the first-principle calculations that the tetragonal distortion (c/a∼1.25) yields a large uniaxial MAE (700-800 μeV/atom) in FeCo alloys [2, 3]. There are two factors which are important to understand the magnetization process of FePt/FeCo bilayer films: one is the uniaxial magnetic anisotropy induced by a tetragonal distortion at the interface between FePt and FeCo layers and the other is an exchange coupling between two layers. In the present work, the tetragonal distortion in FeCo at the interface between FePt and FeCo layers is observed by XRD and TEM analysis, and the uniaxial magnetic anisotropy is evaluated from the magnetization process of FePt/FeCo and FePt/Cu/FeCo films. Correlation between the tetragonal distortion and magnetic anisotropy is studied.
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U2 - 10.1109/INTMAG.2015.7157512
DO - 10.1109/INTMAG.2015.7157512
M3 - Conference contribution
AN - SCOPUS:84942474629
T3 - 2015 IEEE International Magnetics Conference, INTERMAG 2015
BT - 2015 IEEE International Magnetics Conference, INTERMAG 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2015 IEEE International Magnetics Conference, INTERMAG 2015
Y2 - 11 May 2015 through 15 May 2015
ER -