Kojima Takayuki, Ogiwara Misako, Mizuguchi Masaki, Kotsugi Masato, Koganezawa Tomoyuki, Ohtsuki Takumi, Tashiro Taka-Yuki, Takanashi Koki
J Phys Condens Matter. 2014 Feb 12;26(6):064207. doi: 10.1088/0953-8984/26/6/064207.
We prepared L10-ordered FeNi alloy films by alternate deposition of Fe and Ni monatomic layers, and investigated their magnetic anisotropy. We employed a non-ferromagnetic Au-Cu-Ni buffer layer with a flat surface and good lattice matching to L10-FeNi. An L10-FeNi film grown on Au6Cu51Ni43 showed a large uniaxial magnetic anisotropy energy (Ku = 7.0 × 10(6) erg cm(-)3). Ku monotonically increased with the long-range order parameter (S) of the L10 phase. We investigated the Fe-Ni composition dependence by alternating the deposition of Fe 1 − x and Ni 1 + x monatomic layers (− 0.4 < x < 0.4). Saturation magnetization (Ms) and Ku showed maxima (Ms = 1470 emu cm(-3), Ku = 9.3 × 10(6) erg cm(-3)) for Fe60Ni40 (x = -0.2) while S showed a maximum at the stoichiometric composition (x = 0). The change in the ratio of lattice parameters (c/a) was small for all compositions. We found that enrichment of Fe is very effective to enhance Ku. The large Ms and Ku of Fe60Ni40 indicate that Fe-rich L10-FeNi is promising as a rare-earth-free permanent magnet.
我们通过交替沉积铁和镍单原子层制备了L10有序铁镍合金薄膜，并研究了它们的磁各向异性。我们采用了具有平整表面且与L10-FeNi晶格匹配良好的非铁磁性Au-Cu-Ni缓冲层。在Au6Cu51Ni43上生长的L10-FeNi薄膜表现出较大的单轴磁各向异性能量（Ku = 7.0 × 10(6) 尔格·厘米(-)3）。Ku随L10相的长程有序参数（S）单调增加。我们通过交替沉积Fe 1 - x和Ni 1 + x单原子层（-0.4 < x < 0.4）研究了铁镍成分依赖性。对于Fe60Ni40（x = -0.2），饱和磁化强度（Ms）和Ku出现最大值（Ms = 1470 电磁单位·厘米(-3)，Ku = 9.3 × 10(6) 尔格·厘米(-3)），而S在化学计量比成分（x = 0）时出现最大值。所有成分的晶格参数比（c/a）变化都很小。我们发现铁的富集对于增强Ku非常有效。Fe60Ni40较大的Ms和Ku表明富铁的L-10-FeNi有望成为一种无稀土永磁体。
