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E. Tereshina, S. Khmelevskyi, G. Politova, T. Kaminskaya, H. Drulis, I. Tereshina:
"Magnetic ordering temperature of nanocrystalline Gd: enhancement of magnetic interactions via hydrogenization-induced "negative" pressure";
Scientific Reports, 6 (2016), 225531 - 225537.

Gadolinium is a nearly ideal soft-magnetic material. However, one cannot take advantage of its
properties at temperatures higher than the room temperature where Gd loses the ferromagnetic
ordering. By using high-purity bulk samples with grains ~200 nm in size, we present proof-ofconcept
measurements of an increased Curie point (TC) and spontaneous magnetization in Gd due
to hydrogenation. From first-principles we explain increase of TC in pure Gd due to the addition of
hydrogen. We show that the interplay of the characteristic features in the electronic structure of the
conduction band at the Fermi level in the high-temperature paramagnetic phase of Gd and "negative"
pressure exerted by hydrogen are responsible for the observed effect.