Structure and magnetism in nanocrystalline Ca(La)B$_6$ films
Y. Sakuraba, H. Kato, F. Sato, T. Miyazaki, N. Kimura, H. Aoki
TL;DR
This study reports the fabrication of La-doped CaB6 nanocrystalline films via rf-magnetron sputtering, revealing lattice expansion and ferromagnetism that depends on the degree of lattice strain.
Contribution
It demonstrates the relationship between lattice expansion and ferromagnetic properties in La-doped CaB6 films, highlighting the role of lattice strain in inducing magnetism.
Findings
Lattice expansion up to 6% observed in films
Large ferromagnetic moments of 3-4 Bohr magnetons per La detected
Ferromagnetism appears only when lattice expansion exceeds 2.5%
Abstract
Nanocrystalline films of La-doped CaB have been fabricated by using a rf-magnetron sputtering. Lattice expansion of up to 6% with respect to the bulk value was observed along the direction perpendicular to the film plane, which arises from the trapping of Ar gas into the film. Large ferromagnetic moment of 3 ~ 4 Bohr magneton per La has been observed in some La-doped films only when the lattice expansion rate is larger than 2.5%.
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