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Surface ferromagnetism and exchange bias in vacuum annealed films
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View: Figures


Image of FIG. 1.
FIG. 1.

TEM images of (a) CZO-A and (b) CZO-HV. The insets show the pattern with the simulated diffraction pattern for spinel phase in (a) and CoO (solid lines) and Co (dotted lines) phase in (b). Inset on the right panel in (b) show the HRTEM images of particle surface. The CO-HV particle has a crystalline CoO core with a disordered surface component. The CZO-HV particle has a crystalline core surrounded by amorphous (or weakly crystalline) . (c) Co and (d) O XPS spectra of CZO-A and CZO-HV.

Image of FIG. 2.
FIG. 2.

(a) Room temperature loops for the air (blue closed symbol) and HV (red open symbol) thin films of CO, CZ25O, and CZO. (b) Magnetization vs temperature curves under ZFC (open symbols) and FC (filled symbols) conditions with an applied field of of air (blue triangle) and vacuum (red square) annealed samples. (c) ZFC and FC (with ) curves measured at for vacuum annealed CO, CZ25O, and CZO thin films.

Image of FIG. 3.
FIG. 3.

(a) Temperature dependence of the exchange bias for CO-HV, CZ25O-HV, and CZO-HV. (b) Thermoremanent magnetization (TRM) measured under zero field during warm up after field cooling under for HV annealed samples.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Surface ferromagnetism and exchange bias in vacuum annealed Co3−yZnyO4 films