We show that the magnetism of Fe/Cu nanostructured thin films can be controlled by adjusting an interfacial FeCu alloy formed during in situ ion-beam bombardment of the Fe atoms, promoting intermixing between the Fe and Cu, forming an FeCu alloy. This intermixing results in prominent changes to the inter- and intracrystallite interactions which govern the magnetism. With increased interfacial alloy content, the films were modified from a multilayer to a dispersion morphology. This control over increased disorder tuned the magnetic interactions, such as enabling the coexistence of superparamagnetism of Fe nanocrystallites and magnetic ordering of the FeCu component so that a film’s coercivity increased with warming near T_C.

中文翻译：

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Fe / Cu薄膜磁性的界面工程控制

我们表明，可以通过调节在原位离子束轰击Fe原子过程中形成的界面FeCu合金，促进Fe和Cu之间的混合，从而形成FeCu合金，来控制Fe / Cu纳米结构薄膜的磁性。这种混合导致控制磁性的晶间和晶内相互作用发生显着变化。随着界面合金含量的增加，将膜从多层改性为分散体形态。对增加的无序的控制调节了磁性相互作用，例如使得能够使Fe纳米微晶的超顺磁性共存和FeCu组分的磁性有序共存，从而使薄膜的矫顽力随着在T _C附近的升温而增加。