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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Magnetic Transition and Structural Evolution in NiCo/Ag Multilayers
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Magnetic Transition and Structural Evolution in NiCo/Ag Multilayers

机译：NiCo / Ag多层膜中的磁跃迁和结构演化

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摘要

The structures and magnetic properties of Ni_(77)Co_(23) (1.8 nm)/Ag (t_(Ag) nm) multilayers, prepared by dc-magnetron sputtering, have been studied as a function of Ag layer thickness (t_(Ag)). The films progressively evolve from ferromagnetic to superparamagnetic with t_(Ag) increasing from 1.0 to 3.6 nm. This magnetic transition versus t_(Ag) is accompanied by a gradual structural evolution from layered multilayers to a granular system composed of NiCo giant granules. The sizes of giant superparamagnetic granules are approximately 40-80 and 100-140 nm for the samples with t_(Ag) = 3.0 and 3.6 nm, respectively. Furthermore, the granules grow as metastable fcc NiCo phases with a lattice parameter of 0.4044 ± 0.0002 nm. The mechanisms responsible for the phenomena and the relationship between magnetization and structural evolution in the films are discussed.
机译：研究了通过直流磁控溅射制备的Ni_（77）Co_（23）（1.8 nm）/ Ag（t_（Ag）nm）多层膜的结构和磁性能与Ag层厚度（t_（Ag ））。薄膜从铁磁性逐渐演化为超顺磁性，t_（Ag）从1.0纳米增加到3.6纳米。这种相对于t_（Ag）的磁跃迁伴随着从多层结构到由NiCo巨型颗粒组成的颗粒系统的逐渐结构演变。对于t_（Ag）= 3.0和3.6 nm的样品，巨型超顺磁性颗粒的尺寸分别约为40-80和100-140 nm。此外，颗粒以亚稳态的fcc NiCo相生长，晶格参数为0.4044±0.0002 nm。讨论了造成这种现象的机理以及薄膜中磁化强度与结构演变之间的关系。

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