Electronic and nuclear magnetic anisotropy of cobalt-doped ZnO single-crystalline microwires

Adrien Savoyant (1) , O. Pilone (1) , S. Bertaina (1) , Fabian Delorme (2) , Fabien Giovannelli (2)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 GREMAN - UMR 7347 - GREMAN (matériaux, microélectronique, acoustique et nanotechnologies)

Using electron paramagnetic resonance (EPR), we investigate the electronic and nuclear magnetic properties of ZnO:Co single crystals, grown by the optical furnace method. The high crystal quality of the studied samples allows for the determination of the full hyperfine and g tensors. We explain how the local magnetic anisotropy of the Co 2+ impurities is used as a very fine probe for the local symmetry and crystal quality of the host. The temperature-and power-study of EPR intensities recorded in three static-and microwave-field configurations give a qualitative insight into the dynamics of spin-lattice and spin-spin relaxations. In addition, in the context of nanostructures, we explain how a detailed analysis of the intensities anisotropy can reveal the proportion of ordered and disordered phases.

Mots clés: 7630Fc; 7530Gw; 7550Pp; numbers: 6172uj

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Matière Condensée [cond-mat]

Adrien Savoyant, O. Pilone, S. Bertaina, Fabian Delorme, Fabien Giovannelli. Electronic and nuclear magnetic anisotropy of cobalt-doped ZnO single-crystalline microwires. Superlattices and Microstructures, 2019, 125, pp.113-119. ⟨10.1016/j.spmi.2018.10.024⟩. ⟨hal-01929220⟩