Anomalous magnetization processes and non-symmetrical domain wall displacements in L10 FePt particulate films

Effect of the surface anisotropy and the shape on the magnetization behavior in an egg-shaped nanoparticle

“…This phenomenon usually appears in the ferromagnetic nanoparticle with antiferromagnetic shell [14][15][16][17], and is affected by the interfacial coupling between the core and the shell. An anomalous magnetization behavior was observed in an elongated multi-domain particle [18]. The shape and the surface anisotropy may be the reason to induce the exchange bias in the present system.…”

“…Whether the shape of the nanoparticle affects the magnetization behavior of the particle has not been studied much theoretically. In experiments, Li and his colleagues found an anomalous magnetization process in PtFe film composed of particles with different shapes [18]. In this paper, we select a ferromagnetic nanoparticle with an egg shape and study its magnetization behavior.…”

Exchange spring in A1/L1 FePt composite and its application in magnetic force microscope

“…The shifting of out-of-plane loop was shown and explained. 13,14 Whereas in this work, the loop shifted along in-plane direction. As mentioned before, at x ¼ 60, the magnetizations of both Fe-riched A1-FePt and L1 0 -FePt led to the measured hysteresis loops.…”

“…The out-of-plane reversal process can be regarded as the result of domain-wall assisted pining in L1 0 -FePt. 14 The physical reason for the shifting of in-plane hysteresis loop will be discussed later.…”

Magnetization behavior of L10-ordered FePt alloy thin films prepared on MgO(100), MgAl2O4(100), and KTaO3(100) single-crystal substrates

“…It is well known that magnetization and coercivity depend strongly on the characteristic size and morphology of the assemblies of ferromagnetic particles. Several studies have recently been carried out on L1 0 -ordered [CuAu (I)-type] FePt thin films [1][2][3][4][5][6][7][8] and nanoparticles [9][10][11][12][13] by conventional thin-film preparation methods and chemical synthesis, since they possess high uniaxial magnetocrystalline anisotropy (K u = 7.0 × 10 7 erg=cm 3 ), 14) moderate saturation magnetization, and high corrosion resistance. It is also considered to overcome the problem of thermal fluctuation on the nanometer scale.…”