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Abstract
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-of-concept 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.
Highlights
Arrott-Belov plot method used for determining the TCs makes it easy to overcome unwanted thermal and magnetic field effects[23]
The main purpose of the work is the determination of the physical mechanisms behind the hydrogen-induced Curie temperature enhancement in Gd
In order to explore the physical mechanisms behind the hydrogen-induced Curie temperature enhancement in Gd, we performed first-principle calculations
Summary
Arrott-Belov plot method used for determining the TCs makes it easy to overcome unwanted thermal and magnetic field effects[23]. Another method of finding the TC is from the magnetocaloric effect (MCE) measurements. The former enables the true TC in pure and hydrogen-charged Gd to be determined, offering a direct comparison with first principle calculations.
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