Large coercivity in nanostructured rare-earth-free MnxGa films
Large coercivity in nanostructured rare-earth-free MnxGa films
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DOI：
10.1063/1.3671329
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发表时间：
2011-11
影响因子：
4
通讯作者：
T. Nummy;S. Bennett;T. Cardinal;D. Heiman
中科院分区：
文献类型：
--
作者：
T. Nummy;S. Bennett;T. Cardinal;D. Heiman
当用合适尺寸和取向的纳米颗粒制备时，MnxGa薄膜表现出非常大的矫顽场，高达μoHC = 2.5 T。这种矫顽磁力比有序外延膜对应物和体材料大一个数量级。增强的磁性归因于大的磁晶各向异性和尺寸为50-100 nm的纳米颗粒的组合。大的介电常数也通过反常霍尔效应在电学性质中复制。的磁势的大小接近发现在稀土磁体，使他们有吸引力的稀土磁铁的应用。
The magnetic hysteresis of MnxGa films exhibit remarkably large coercive fields as high as μoHC = 2.5 T when fabricated with nanoscale particles of a suitable size and orientation. This coercivity is an order of magnitude larger than in well-ordered epitaxial film counterparts and bulk materials. The enhanced coercivity is attributed to the combination of large magnetocrystalline anisotropy and ∼50-100 nm size nanoparticles. The large coercivity is also replicated in the electrical properties through the anomalous Hall effect. The magnitude of the coercivity approaches that found in rare-earth magnets, making them attractive for rare-earth-free magnet applications.