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An electron paramagnetic resonance study of -type : A diluted magnetic semiconductor
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Image of FIG. 1.
FIG. 1.

(Color online) X-ray diffraction (XRD) spectrum of a thick thin film grown on (0001) sapphire.

Image of FIG. 2.
FIG. 2.

Variation of the electrical resistivity of a thin film.

Image of FIG. 3.
FIG. 3.

(Color online) EPR spectra of at and ; (a) , (b) , (c) , (d) , and (e) .

Image of FIG. 4.
FIG. 4.

(Color online) Variation of the peak to peak linewidth vs temperature for different Mn concentrations: , 0.12, 0.16, 0.22, and 0.34; the insert shows the fit with a function for .

Image of FIG. 5.
FIG. 5.

(Color online) Curie-Weiss plot for and .

Image of FIG. 6.
FIG. 6.

(Color online) Concentration dependence of the normalized Curie-Weiss temperatures of ZnMnO, CdMnTe, and CdMnSe; they are deduced from and the Curie-Weiss temperatures measured in this work for (▵) in magnetic fields parallel and perpendicular to the plane of the film and compared to those obtained from the analysis of the magnetic susceptibility in CdMnTe (∎) and CdMnSe (●) (Ref. 20), or the magnetization curves (Ref. 26) in (엯) . The full line at corresponds to the law with . The full line at is a guide for the eyes.

Image of FIG. 7.
FIG. 7.

Infinite temperature linewidth as a function of Mn concentration.

Image of FIG. 8.
FIG. 8.

(Color online) Resonance field as a function of temperature for the different Mn concentrations; the magnetic field is oriented normal to the film plane.

Image of FIG. 9.
FIG. 9.

(Color online) Resonance field as a function of temperature for the different Mn concentrations; the magnetic field is oriented parallel to the film plane, i.e., in plane.

Image of FIG. 10.
FIG. 10.

(Color online) Resonance field shift due to the interaction with the free electrons according to the extended model Eq. (12) (red triangles) and the demagnetization fields (magenta stars). The sum of these two contributions (blue circles) is compared with the experimental results (blue squares) for and perpendicular to the film plane; the simulations are valid only in the high temperature non shaded region.

Image of FIG. 11.
FIG. 11.

(Color online) Effective exchange integral as a function of the mean cation-cation distance for , ZnMnS (Ref. 29), ZnMnSe (Ref. 30), and ZnMnTe; (Ref. 1); for ZnMn(S,Se,Te) the Mn concentration is .


Generic image for table
Table I.

: peak-to-peak EPR linewidths , Curie-Weiss temperatures , , and exchange integrals , and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An electron paramagnetic resonance study of n-type Zn1−xMnxO: A diluted magnetic semiconductor