Experimental study of antiferromagnetic resonance in noncollinear antiferromagnetic Mn3Al2Ge3O12


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Abstract

We have measured antiferromagnetic resonance (AFMR) frequency-field dependences for aluminum–manganese garnet Mn3Al2Ge3O12 at frequencies from 1 to 125 GHz and fields up to 6 T. There are three AFMR modes for all orientations, their zero field gaps are about 40 and 70 GHz. Andreev–Marchenko hydrodynamic theory [7] well describes experimental frequency–field dependences. We have observed hysteresis of resonance absorption as well as history dependence of resonance absorption near gap frequencies below 10 kOe in all three measured field orientations, which are supposedly due to the sample domain structure. Observation of the AFMR signal at the frequencies from 1 to 5 GHz allows to estimate repulsion of nuclear and electron modes of spin precession in the vicinity of spin-reorientation transition at H || [100].

About the authors

Yu. V. Krasnikova

Kapitza Institute for Physical Problems; National Research University Higher School of Economics

Author for correspondence.
Email: krasnikova.mipt@gmail.com
Russian Federation, Moscow, 119334; Moscow, 101000

V. N. Glazkov

Kapitza Institute for Physical Problems; National Research University Higher School of Economics

Email: krasnikova.mipt@gmail.com
Russian Federation, Moscow, 119334; Moscow, 101000

T. A. Soldatov

Kapitza Institute for Physical Problems; Moscow Institute of Physics and Technology

Email: krasnikova.mipt@gmail.com
Russian Federation, Moscow, 119334; Dolgoprudny, 141700

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