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Longitudinal and polar MOKE magnetometry of magnetoresistive cobalt thin films prepared by thermal evaporation
Sirisathitkul, C1, Pansong, Y2, Rattanasuporn, S3.
Cobalt films of thickness 21, 29 and 68 nm were prepared by thermal evaporation with a deposition rate around 0.3 nm/s. Their hysteresis loops from longitudinal and polar magneto-optic Kerr effect (MOKE) magnetometry differed from typical characteristics of uniaxial magnetic anisotropy but still indicated the preference of in-plane anisotropy over perpendicular anisotropy. The longitudinal hysteresis loop of the 68 nm-thick film was decidedly in a transcritical state signified by an enhanced coercive field. Changing the angle (θ) between the 2500 Oe-magnetic field and the current gave rise to the change in electrical resistance (Rθ) of 29 nm-thick film and the plot between Rθ and cos2θ could be linearly
fitted. The changes in resistance due to this anisotropic magnetoresistance (AMR) effect ranged from -0.08 % (θ = 90º) to +0.04 % (θ = 0º).
Affiliation:
- Walailak University, Thailand
- Walailak University, Thailand
- Synchrotron Light Research Institute, Thailand
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Scopus 2020 |
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