Spin echo studies of heavily cobalt-doped <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>ZnO</mi><mo>:</mo><msup><mi mathvariant="normal">Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>: Electron spectral diffusion under dynamic nuclear polarization

D. V. Azamat; L. Jastrabik; M. Fanciulli; A. Dejneka; D. R. Yakovlev; M. Bayer

doi:10.1103/fyz9-3dbm

Spin echo studies of heavily cobalt-doped $ZnO : {Mn}^{2 +}$ : Electron spectral diffusion under dynamic nuclear polarization

D. V. Azamat ^1,*, L. Jastrabik ², M. Fanciulli ³, A. Dejneka², D. R. Yakovlev ¹, and M. Bayer ^1,4

¹Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany
²Institute of Physics of the Czech Academy of Sciences, 182 21, Prague 8, Czech Republic
³Department of Chemistry, University of Torino, Via P. Giuria 9, 10125 Torino, Italy
⁴Research Center FEMS, Technische Universität Dortmund, D-44221 Dortmund, Germany

^*Contact author: dmitry.azamat@tu-dortmund.de

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Phys. Rev. B 112, 214421 – Published 10 December, 2025

DOI: https://doi.org/10.1103/fyz9-3dbm

Abstract

The dynamic nuclear polarization (DNP) in a system of ${Mn}^{2 +}$ spins is studied in a weakly ferromagnetic matrix formed in heavily cobalt-doped ZnO single crystals. It is established that the thermal mixing mechanism of DNP leads to cooling of the common reservoir of electron spin-spin interactions of the ${Mn}^{2 +}$ and ${Co}^{2 +}$ spins to a single spin temperature in the rotating frame. We show the variation of the polarization amplification of the common nuclear subsystem as a function of microwave irradiation frequency.

Physical Review B

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Spin echo studies of heavily cobalt-doped $ZnO : {Mn}^{2 +}$ : Electron spectral diffusion under dynamic nuclear polarization

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Spin echo studies of heavily cobalt-doped ZnO:Mn2+: Electron spectral diffusion under dynamic nuclear polarization

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Spin echo studies of heavily cobalt-doped $ZnO : {Mn}^{2 +}$ : Electron spectral diffusion under dynamic nuclear polarization