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Superferromagnetism and coercivity in Co-Al2O3 granular films with perpendicular anisotropy
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Concentration dependences of the film’s effective magnetization obtained by the FMR and VSM techniques. (b) Typical FMR spectra for films with different cobalt contents. In all cases, the external magnetic field was applied perpendicularly to the film plane.

Image of FIG. 2.
FIG. 2.

Cross-sectional TEM micrograph of the sample with x = 0.55. The inset shows a polar plot of the directional histogram for the TEM scan.

Image of FIG. 3.
FIG. 3.

Temperature dependence of the coercivity measured along the normal to the film for the sample with x = 0.55. The inset shows the in-plane magnetization curve at RT.

Image of FIG. 4.
FIG. 4.

MFM scans for the samples with: x  = 0.49, x  = 0.55, and x  = 0.58 for the left, central, and right panes, respectively. The root mean square values of the phase shift for the scans are 0.32°, 0.17°, and 0.063°, respectively.

Image of FIG. 5.
FIG. 5.

A typical 20  ×  20 μm2 topographic image at 300 K (a) and the corresponding MFM patterns at different temperatures: (b) 300 K, (c) 350 K, (d) 420 K.

Image of FIG. 6.
FIG. 6.

Magnetic contrast extracted from temperature dependent MFM images of the film with x  = 0.55. The magnetic contrast is represented by the root mean square of the phase shift for the scanned image. A gradual disappearance of the magnetic contrast is observed as the magnetization decreases with the system approaching the phase transition.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superferromagnetism and coercivity in Co-Al2O3 granular films with perpendicular anisotropy