Persisting correlation between electrical transport and magnetic dynamics in M-type hexaferrites

In this work, we present frequency-dependent magnetic susceptibility and dc electric transport properties of three different compositions of hexaferrite Ba1-xPbxFe12-yAlyO19 single crystals. We found a correlation between the activation energies of the dc electric transport and the ac magnetic susceptibility which persists over the whole studied range of aluminum substitution y = 0-3.3. This result is discussed in the context of charged magnetic domain walls, the pinning of which is determined by charge carriers activated across the transport gap. Our work points toward a general relaxation mechanism in ferrimagnetic semiconductors that directly affects the dynamic magnetic properties via electrical transport. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study presents the frequency-dependent magnetic susceptibility and dc electric transport properties of three different compositions of hexaferrite Ba1-xPbxFe12-yAlyO19 single crystals. The correlation between the activation energies of the dc electric transport and the ac magnetic susceptibility is found to persist over the entire studied range of aluminum substitution y = 0-3.3, pointing toward a general relaxation mechanism in ferrimagnetic semiconductors that directly affects the dynamic magnetic properties via electrical transport.