Flexomagnetic effect in Mn-based antiperovskites

Details Flexomagnetic effect in Mn-based antiperovskites Flexomagnetic effect in Mn-based antiperovskites

2009-09-09

arxiv.org/abs/0909.1813v1

Physics

Condensed Matter

Materials Science

Scientific paper

We report appearance of the net magnetization in Mn-based antiperovskite compounds as a result of the external strain gradient (flexomagnetic effect). In particular, we describe the mechanism of the magnetization induction in the Mn_{3}GaN at the atomic level in terms of the behavior of the local magnetic moments (LMM) of the Mn atoms. We show that the flexomagnetic effect is linear and results from the non-uniformity of the strain, i.e. it is absent not only in the ground state but also when the applied external strain is uniform. We estimate the flexomagnetic coefficient to be 1.95 mu_{B}*angstrom. We show that at the moderate values of the strain gradient (~ 0.1%) the flexomagnetic contribution is the only non-vanishing input to the induced magnetization.

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