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Interface Magnetism Studied by Electron Holography with Multiple-biprisms

Revealing spin order in interface regions is important for both materials science and technologies. An intriguing phenomenon is the magnetic anomaly observed in an antiphase boundary (APB), which is a planar defect produced in ordered alloys. Atomic disordering within an APB has been believed to deteriorate ferromagnetism. Although this relationship induces useful functionalities such as pinning of magnetic domain walls, the magnetic degradation in APBs is deleterious for spintronic applications. Thus, a big challenge in materials science is to explore a distinct type of APB, in which the ferromagnetic spin order is not appreciably depressed; instead, the magnetization can be increased in APBs. Using electron holography with multiple biprisms, we have demonstrated that the magnetization can be amplified in APBs produced in Fe70Al30 [1]. In particular, we employed a technique of splitillumination [2] in order to acquire electron holograms from a portion away from the specimen edge.