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SQUID Magnetometry and Magneto-Optics of Epitaxial EuSe

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Rumpf K., Granitzer P., Kellner W., Kirchschlager R., Janecek S., Pascher H., Krenn H.

Acta Physica Polonica A

2004

vol. 105

issue 6

621-629

The complicated (H,T)-magnetic phase diagram of EuSe is caused by the critical balance between nearest and next nearest neighbour exchange interaction (J_{NN}=0.119 K and J_{NNN}=-0.1209 K) and leads to various spin arrangements NNSS..., NSN..., NNS, NNN... [NS denotes opposite ferromagnetic order in adjacent (111) planes]. Beside the subtle local exchange of 5d-t_{2g} electrons and localized holes with neighbouring Eu-4f spins, obviously also the strain status influences the occurrence of these different phases. We investigate the magnetic ordering phenomenon in a strained 2.5 μm EuSe film on BaF_2 substrate by SQUID magnetometry and magneto-optics like spectral Faraday- and Kerr-effect measurements for temperatures from 2 K up to 200 K and for magnetic fields up to 5 T. The magneto-optical probe monitors the local environment of the photoexcited electron-hole pair, called magnetic exciton, located within a ferromagnetic surrounding (photoinduced magnetic polaron), whereas the integral magnetization measured by SQUID is most sensitive to long-range magnetic ordering. In spite of the dissimilarity of measurement techniques we find an influence of the long-range magnetic order (e.g. of the NNS- or NNN-matrix) on the non-resonant Kerr reflection. The complementarity of SQUID and magneto-optical methods is stringent only in the (resonant) spectral regime, where magnetic polarons are formed.

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1 Acta Physica Polonica A

1 2004

1 Granitzer P.

1 Janecek S.

1 Kellner W.

1 Kirchschlager R.

1 Krenn H.

1 Pascher H.

1 Rumpf K.

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SQUID Magnetometry and Magneto-Optics of Epitaxial EuSe