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Extended Limist of Thin Film Exchange Bias Effect with the Internal Interface Structure in Co-Ni-O Single Layer Film

Title
Extended Limist of Thin Film Exchange Bias Effect with the Internal Interface Structure in Co-Ni-O Single Layer Film
Authors
정민승김태환임미영홍정일
DGIST Authors
홍정일
Issue Date
2019-10-23
Citation
2019 KPS Fall Meeting (가을학술논문발표회)
Type
Conference
Abstract
Exchange couplings at the interface between ferromagnet (FM) and antiferromagnet (AFM) mediated by uncompensated spins causes well-known exchange bias effect breaking the symmetry of the hysteresis loop of the FM layer with respect to the external magnetic field. In the present study, we achieved enhanced exchange bias effect with a phase mixture single layer film including 3-dimensional spatial distribution of internal interfaces between ferromagnetic (Co0.7Ni0.3) and antiferromagnetic (Co0.7Ni0.3O) phases involving both exchange and super-exchange couplings within an extended region around the interface [1]. The phase mixture single layer film exhibited the exchange bias effect by itself and its magnitude is independent from the FM layer thickness. This violates the conventionally accepted relationship of inverse proportionality between the exchange bias field and the thickness of the magnetic layer in the FM/AFM bilayers systems [2]. Furthermore, it was found that the magnetic shape anisotropy in the film is suppressed due to its internal microstructures, thereby the exchange bias could be set in an arbitrary direction with respect to the film surface. The limitation of low blocking temperature of the phase mixture single layer in the present study could also be overcome with an additional neighboring antiferromagnet layer, which shows large exchange bias field compared to conventional bilayers with permalloy (Ni0.8Fe0.2) as FM materials.
URI
http://hdl.handle.net/20.500.11750/14227
Publisher
한국물리학회
Related Researcher
  • Author Hong, Jung-Il Spin Nanotech Laboratory
  • Research Interests Electric and Magnetic Properties of Nanostructured Materials; Spintronics
Files:
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Collection:
Department of Physics and ChemistrySpin Nanotech Laboratory2. Conference Papers


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