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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Ferromagnetism in DyRh and DyRhX (X = Fe, Ni, Co, Gd) thin films
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Ferromagnetism in DyRh and DyRhX (X = Fe, Ni, Co, Gd) thin films

机译：DyRh和DyRhX（X = Fe，Ni，Co，Gd）薄膜中的铁磁性

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摘要

In an effort to achieve large high-field magnetization and increased Curie temperature, polycrystalline DyRh, (DyRh)(95)X-5 and (DyRh)(85)X-15 (X = Fe, Co, Ni, Gd) thin films have been prepared via ultra-high vacuum dc co-sputtering on SiO2 and Si wafers, using Ta as seed and cap material. A body-centred cubic CsCl-like crystal formation (B2 phase) was achieved for DyRh around the equiatomic equilibrium, known from single crystals. The maximum in-plane spontaneous magnetization at T = 4 K in fields of mu H-0 = 5T was found to be mu M-0(S,4K) = (1.50 +/- 0.09) T, with a ferromagnetic transition at T-C = (5 +/- 1) K and a coercivity of mu H-0(C,4K)[D] = (0.010 +/- 0.001)T (at T = 4 K) for layers deposited on substrates heated to 350 degrees C. Samples prepared at room temperature exhibited poorer texture, smaller grains and less B2-phase content; this did impact on the Curie temperature, which was higher compared to those layers with best crystallisation. However, the maximal magnetization remained unaffected. Ferromagnetic coupling was observed in ternary alloys of DyRhGd and DyRhNi with an increased Curie temperature, larger initial permeability and high-field magnetization, which was best for (DyRh)(85)Gd-15 with mu M-0(S,4K)[Gd15] = (2.10 +/- 0.13) T. DyRhFe and DyRhCo showed antiparallel coupling of spontaneous magnetic moments.
机译：为了实现大的高磁场磁化和提高居里温度，多晶DyRh，（DyRh）（95）X-5和（DyRh）（85）X-15（X = Fe，Co，Ni，Gd）薄膜通过使用Ta作为籽晶和帽盖材料，在SiO2和Si晶圆上通过超高真空dc共溅射制备了这些材料。对于DyRh，在单原子已知的等原子平衡附近实现了体心立方CsCl状晶体形成（B2相）。在mu H-0 = 5T的场中，在T = 4 K时的最大平面内自发磁化强度为mu M-0（S，4K）=（1.50 +/- 0.09）T，在TC处有铁磁跃迁=（5 +/- 1）K，矫顽力为μH-0（C，4K）[D] =（0.010 +/- 0.001）T（在T = 4 K时），用于沉积在加热至350度的基板上在室温下制备的样品表现出较差的质地，较小的晶粒和较少的B 2相含量;这确实影响了居里温度，而居里温度则比那些结晶度最高的层高。但是，最大磁化强度不受影响。在DyRhGd和DyRhNi三元合金中观察到铁磁耦合，居里温度升高，初始磁导率更高，且磁场强度高，这最适用于具有mu M-0（S，4K）的（DyRh）（85）Gd-15。 Gd15] =（2.10 +/- 0.13）T. DyRhFe和DyRhCo显示出自发磁矩的反平行耦合。

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