Magnetization and Chromium Ions with Minority Valence in CdCr2S4 and HgCr2Se4 Magnetic Semiconductors

The effect of Cr ions of different valences ͑Cr 2ϩ , Cr 3ϩ , and Cr 4ϩ ͒ on the magnetic anisotropy and ferromagnetic resonance ͑FMR͒ linewidth in ferromagnetic semiconductors, with specific application to the chromium chalcogenide spinels CdCr 2 Se 4 and HgCr 2 Se 4 ͑''as grown and Ag doped''͒, is studied theoretically and experimentally. We generalize various previous calculations and show that the line shape of the FMR depends on the conductivity, the frequency, and the sample dimension. Crystal-field theory is used to calculate the Cr ions low-lying energy levels and their effect on the magnetic anisotropy and FMR relaxation. In particular, we find that the orbital ground state of the Cr 2ϩ ion is a doublet and causes a symmetry breaking of the anisotropy from cubic, at high temperatures, to noncubic at low temperatures. We report FMR data of single crystals of CdCr 2 Se 4 with 0.1 mole % Ag doped, where this effect is seen. Moreover, several relaxation mechanisms are identified which allow the estimates of exchange fields and microscopic relaxation times of Cr ions in these crystals.

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Optical and magneto-optical effects in Hg1-x Cd x Cr2Se4 (0 ⩽ x ⩽ 1) single crystals

Sukhorukov

Telegin

Bebenin

et al. 2015

J. Exp. Theor. Phys.

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Magnetization and Chromium Ions with Minority Valence in CdCr₂S₄ and HgCr₂Se₄ Magnetic Semiconductors

Cited by 4 publications

References 3 publications

Magnetically ordered multinary semiconductors

Magnetically ordered multinary semiconductors

Magnetic properties of chromium chalcogenide spinels:Cd1−xAg
Ferreira
¹
,
Coutinho‐Filho
²

1996
Phys. Rev. B
4
0
3
0
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Optical and magneto-optical effects in Hg1-x Cd x Cr2Se4 (0 ⩽ x ⩽ 1) single crystals

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Magnetization and Chromium Ions with Minority Valence in CdCr2S4 and HgCr2Se4 Magnetic Semiconductors

Cited by 4 publications

References 3 publications

Magnetically ordered multinary semiconductors

Magnetically ordered multinary semiconductors

Magnetic properties of chromium chalcogenide spinels:Cd1−xAgFerreira1, Coutinho‐Filho2 1996Phys. Rev. B4030View full textAdd to dashboardCite

Optical and magneto-optical effects in Hg1-x Cd x Cr2Se4 (0 ⩽ x ⩽ 1) single crystals

Contact Info

Product

Resources

About

Magnetization and Chromium Ions with Minority Valence in CdCr₂S₄ and HgCr₂Se₄ Magnetic Semiconductors

Magnetic properties of chromium chalcogenide spinels:Cd1−xAg
Ferreira
¹
,
Coutinho‐Filho
²

1996
Phys. Rev. B
4
0
3
0
View full text Add to dashboard Cite