We report on observation of the exchange bias effect in AuFe co-sputtered alloy films in the as-deposited state and following swift heavy ion irradiation. The Mössbauer spectrum for the as-deposited film shows a broad paramagnetic doublet together with a small contribution from hyperfine magnetic sextets. The magnetization behavior exhibits a spontaneous exchange bias effect at room temperature without application of an external triggering field. The magnitude of exchange bias in the as-deposited sample increases with decreasing temperature, at first gradually down to about 50 K and then more rapidly down to 5 K. Irradiation of AuFe film with 100 MeV Au 9+ ions transforms the Mössbauer spectrum into a broad magnetic sextet, with asymmetric broadening characteristic of the formation of α-Fe magnetic nanoclusters surrounded by shells of reduced Fe concentration. At room temperature the exchange bias field is in the same sense as that for the as-deposited sample, but decr...

中文翻译：

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纳米级AuFe合金膜中交换偏压的观察

我们报告了在沉积状态和随后的重离子快速辐照下对AuFe共溅射合金膜的交换偏压效应的观察。沉积薄膜的Mössbauer光谱显示出宽顺磁性双峰，而超细磁性六边形的贡献很小。磁化行为在室温下表现出自发的交换偏压效应，而无需施加外部触发场。沉积样品中交换偏压的大小随温度降低而增加，首先逐渐降低到大约50 K，然后更快地降低到5K。用100 MeV Au 9+离子辐照AuFe薄膜将Mössbauer光谱转变为广泛的磁性六重奏 具有不对称的增宽特性，形成被铁浓度降低的壳包围的α-Fe磁性纳米团簇。在室温下，交换偏置场与沉积后的样品具有相同的含义，但是会降低...