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Investigation of structure and magnetoresistance in Co/ZnO films
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Image of FIG. 1.
FIG. 1.

Hysteresis loops of as-deposited samples A and C at RT, the inset (a) and (b) show the hysteresis loops of sample A as-deposited measured at 50 K and annealed for 2 h measured at RT, respectively.

Image of FIG. 2.
FIG. 2.

Temperature dependence of the zero-field-cooled and field-cooled magnetization for the three as-deposited samples in 100 Oe field.

Image of FIG. 3.
FIG. 3.

The XRD patterns for sample A and sample C as-deposited and annealed.

Image of FIG. 4.
FIG. 4.

XPS spectra (a) and Zn LMM Auger spectra (b) of sample A and sample C as-deposited.

Image of FIG. 5.
FIG. 5.

The field dependence of MR ratios of as-deposited sample A at 10 K (a) and RT (b), respectively. The inset of Fig. 5(b) shows the dependence of the MR ratio on the Co concentration with the magnetic field up to 20 kOe at RT.

Image of FIG. 6.
FIG. 6.

(a) Dependence of on for as-deposited sample A, the solid line represents the linear fit result with . (b) Temperature dependence of MR for as-deposited sample A from 10 to 300 K. The solid curve represents the theoretical MR given by Eq. (2) with , , and .


Generic image for table
Table I.

The properties of the Co/ZnO as-deposited films. Co concentration from EDS, blocking temperature from ZFC curves, volume of the magnetic regions determined from using , and determined from fit of MR curves using Eq. (1), and the region volume calculated from .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Investigation of structure and magnetoresistance in Co/ZnO films