TY - JOUR
T1 - Asymmetric initial magnetization process of elongated particles in nucleation-type L10 FePt films
AU - Li, Guoqing
AU - Saito, Hitoshi
AU - Ishio, Shunji
AU - Shima, Toshiyuki
AU - Takanashi, Koki
AU - Xiong, Zuhong
N1 - Funding Information:
This research was supported by Natural Science Foundation Project of CQ CSTC, 2006BB4326 and Doctorial Foundation Project of SWUB2006031.
PY - 2007/8
Y1 - 2007/8
N2 - Following the sequence of applied magnetic field H=0→+6 kOe→-6 kOe along easy axis, an asymmetric initial magnetization process of multi-domain particles against the direction of H was observed by using an in-field magnetic force microscopy in nucleation-type L10 FePt films with nominal thickness tN≥25 nm. The initial magnetizations increased quickly due to domain wall movement. At H=+6 kOe, a fraction of particles kept multi-domain configurations though the majority became single domain successively with the increase of H. However, almost all these multi-domain particles became single domain at lower opposite field H=-2 kOe. The saturation magnetizations of particles are hard to reverse because of high nucleation field. This asymmetric behavior is likely to be caused by the intrinsic asymmetry of energy barrier against the movement/wiping out of domain walls due to the geometry of particle, and can be degenerated by the irregularity of particle shape.
AB - Following the sequence of applied magnetic field H=0→+6 kOe→-6 kOe along easy axis, an asymmetric initial magnetization process of multi-domain particles against the direction of H was observed by using an in-field magnetic force microscopy in nucleation-type L10 FePt films with nominal thickness tN≥25 nm. The initial magnetizations increased quickly due to domain wall movement. At H=+6 kOe, a fraction of particles kept multi-domain configurations though the majority became single domain successively with the increase of H. However, almost all these multi-domain particles became single domain at lower opposite field H=-2 kOe. The saturation magnetizations of particles are hard to reverse because of high nucleation field. This asymmetric behavior is likely to be caused by the intrinsic asymmetry of energy barrier against the movement/wiping out of domain walls due to the geometry of particle, and can be degenerated by the irregularity of particle shape.
KW - Asymmetric magnetization process
KW - Domain configuration
KW - Elongated particle
KW - In-field magnetic force microscopy
KW - L1 FePt film
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U2 - 10.1016/j.jmmm.2007.03.197
DO - 10.1016/j.jmmm.2007.03.197
M3 - Article
AN - SCOPUS:34248561395
VL - 315
SP - 126
EP - 131
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 2
ER -