Publication

Positive exchange bias in thin film multilayers produced with nano-oxide layer

2013
Journal Articles

Abstract

We report a positive exchange bias in thin film multilayers produced with nano-oxide layer. The positive exchange bias resulted from an antiferromagnetic interfacial exchange coupling between the ferromagnetic CoFe and the antiferromagnetic CoO layers, which spontaneously forms on top of the nano-oxide layer during the subsequent deposition of a CoFe layer. The shift in the hysteresis loop along the direction of the cooling field and the change in the sign of exchange bias are evidence of antiferromagnetic interfacial exchange coupling. The high temperature positive exchange bias observed for our system results from magnetic proximity effects between CoFe and CoO.

Official source

https://infoscience.epfl.ch/entities/publication/ed7085fc-401e-4914-9b71-578aeb9372ca

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2013
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/ed7085fc-401e-4914-9b71-578aeb9372ca

About this result

Related concepts (23)

Thin film

A thin film is a layer of material ranging from fractions of a nanometer (monolayer) to several micrometers in thickness. The controlled synthesis of materials as thin films (a process referred to as deposition) is a fundamental step in many applications. A familiar example is the household mirror, which typically has a thin metal coating on the back of a sheet of glass to form a reflective interface. The process of silvering was once commonly used to produce mirrors, while more recently the metal layer is deposited using techniques such as sputtering.

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Thin-film optics is the branch of optics that deals with very thin structured layers of different materials. In order to exhibit thin-film optics, the thickness of the layers of material must be similar to the coherence length; for visible light it is most often observed between 200 and 1000 nm of thickness. Layers at this scale can have remarkable reflective properties due to light wave interference and the difference in refractive index between the layers, the air, and the substrate.

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Positive exchange bias in thin film multilayers produced with nano-oxide layer

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