Atomic Structures and Spin Fluctuations in Y–Ni Amorphous Alloys
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概要
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The local atomic structures, the magnetic properties and their interrelationship have been investigated for Y<I><SUB>x</SUB></I>Ni<SUB>100−<I>x</I></SUB> (<I>x</I>=14, 25 and 40) amorphous alloys prepared by sputtering. The nearest neighbour Ni–Ni and Y–Ni correlations have an asymmetric distribution in Y<SUB>14</SUB>Ni<SUB>86</SUB> amorphous alloy. The structural parameters indicate that the arrangement of Ni atoms around Y atom is similar to that in Y<SUB>2</SUB>Ni<SUB>17</SUB> and YNi<SUB>5</SUB> compounds. On the other hand, the local structure in Y<SUB>25</SUB>Ni<SUB>75</SUB> amorphous alloy is different from that in crystalline counterpart YNi<SUB>3</SUB>. The high degree of atomic short-range order in the Y<SUB>14</SUB>Ni<SUB>86</SUB> amorphous alloy plays an important role in the onset of ferromagnetism. The local atomic structure in the Y<SUB>25</SUB>Ni<SUB>75</SUB> amorphous alloy is close to a random-packing type, and hence the ferromagnetism is not established in contrast with the crystalline counterpart YNi<SUB>3</SUB>. The influence of spin fluctuations on the magnetic properties is clearly observed in high Ni concentration ranges. The relation between the temperature T and the magnetization M exhibits a linear relation of the form in <I>M</I><SUP>2</SUP>–<I>T</I><SUP>4⁄3</SUP> in the vicinity of the Curie temperature. At lower temperatures, however, <I>M</I><SUP>2</SUP> varies with <I>T</I><SUP>2</SUP> because of the longitudinal spin fluctuations.
- 社団法人 日本金属学会の論文
社団法人 日本金属学会 | 論文
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