TY - JOUR
T1 - Perpendicularly magnetized L 10-FePt nanodots exchange-coupled with soft magnetic Ni81Fe19
AU - Zhou, W.
AU - Seki, T.
AU - Iwama, H.
AU - Shima, T.
AU - Takanashi, K.
N1 - Publisher Copyright:
© 2015 AIP Publishing LLC.
PY - 2015/1/7
Y1 - 2015/1/7
N2 - We studied exchange-coupled bilayers consisting of a perpendicularly magnetized L10-FePt layer and a soft magnetic Ni81Fe19 (Permalloy; Py) layer, where the Py layer was thick enough to form spatially twisted magnetic structures. The Py layer showed in-plane magnetization in the case of unpatterned thin film because of its demagnetizing field even though Py was exchange-coupled to the perpendicularly magnetized L10-FePt layer at the interface. After patterning the FePt/Py bilayer into nanosized dots with cylindrical shape, the effective perpendicular magnetic anisotropy was induced. Exchange-coupling behavior, i.e., spring back behavior, was observed when the minor magnetization curves were measured. In addition to this behavior, the magnetic domain observation suggested that a spatially twisted magnetic structure was formed with sweeping the perpendicular magnetic field.
AB - We studied exchange-coupled bilayers consisting of a perpendicularly magnetized L10-FePt layer and a soft magnetic Ni81Fe19 (Permalloy; Py) layer, where the Py layer was thick enough to form spatially twisted magnetic structures. The Py layer showed in-plane magnetization in the case of unpatterned thin film because of its demagnetizing field even though Py was exchange-coupled to the perpendicularly magnetized L10-FePt layer at the interface. After patterning the FePt/Py bilayer into nanosized dots with cylindrical shape, the effective perpendicular magnetic anisotropy was induced. Exchange-coupling behavior, i.e., spring back behavior, was observed when the minor magnetization curves were measured. In addition to this behavior, the magnetic domain observation suggested that a spatially twisted magnetic structure was formed with sweeping the perpendicular magnetic field.
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U2 - 10.1063/1.4905302
DO - 10.1063/1.4905302
M3 - Article
AN - SCOPUS:84923583317
VL - 117
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 1
M1 - 013905
ER -