Fe-Ni composition dependence of magnetic anisotropy in artificially fabricated L10-ordered FeNi films
Fe-Ni composition dependence of magnetic anisotropy in artificially fabricated L10-ordered FeNi films
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DOI：
10.1088/0953-8984/26/6/064207
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发表时间：
2014-02-12
影响因子：
2.7
通讯作者：
Takanashi, Koki
中科院分区：
文献类型：
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作者：
Kojima, Takayuki;Ogiwara, Misako;Takanashi, Koki
我们通过铁和镍单原子层的交替沉积制备了L1(0)有序的铁镍合金薄膜，并研究了它们的磁各向异性。我们采用了一种非铁磁性的金 - 铜 - 镍缓冲层，它具有平坦的表面且与L1(0) - 铁镍有良好的晶格匹配。在Au6Cu51Ni43上生长的L1(0) - 铁镍薄膜显示出较大的单轴磁各向异性能（Ku = 7.0×10⁶尔格/立方厘米）。Ku随L1(0)相的长程有序参数（S）单调增加。我们通过交替沉积Fe₁₋ₓ和Ni₁₊ₓ单原子层（ - 0.4 < x < 0.4）研究了铁 - 镍成分的依赖性。对于Fe₆₀Ni₄₀（x = - 0.2），饱和磁化强度（Ms）和Ku显示出最大值（Ms = 1470电磁单位/立方厘米，Ku = 9.3×10⁶尔格/立方厘米），而S在化学计量成分（x = 0）处显示出最大值。对于所有成分，晶格参数比（c/a）的变化都很小。我们发现铁的富集对于提高Ku非常有效。Fe₆₀Ni₄₀的大Ms和Ku表明富铁的L10 - 铁镍作为一种无稀土永磁体是有前景的。
We prepared L1(0)-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 L1(0)-FeNi. An L1(0)-FeNi film grown on Au6Cu51Ni43 showed a large uniaxial magnetic anisotropy energy (K-u = 7.0 x 10(6) erg cm(-3)). K-u monotonically increased with the long-range order parameter ( S) of the L1(0) 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 (M-s) and K-u showed maxima (M-s = 1470 emu cm(-3), K-u = 9.3 x 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.