Magnetocaloric effect of thin Terbium films

Anselmo, Dory Hélio Aires de Lima; Mello, V. D.; Vasconcelos, Manoel Silva de; Almeida, N. S.

Magnetocaloric effect of thin Terbium films

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dc.contributor.author	Anselmo, Dory Hélio Aires de Lima
dc.contributor.author	Mello, V. D.
dc.contributor.author	Vasconcelos, Manoel Silva de
dc.contributor.author	Almeida, N. S.
dc.date.accessioned	2020-06-04T00:51:31Z
dc.date.available	2020-06-04T00:51:31Z
dc.date.issued	2017-12
dc.description.resumo	We report a theoretical study of the magnetocaloric effect of Terbium (Tb) thin films due to finite size and surface effects in the helimagnetic phase, corresponding to a temperature range from TC=219 K to TN=231 K, for external fields of the order of kOe. For a Tb thin film of 6 monolayers submitted to an applied field (ΔH=30 kOe, ΔH=50 kOe and ΔH = 70 kOe) we report a significative change in adiabatic temperature, ΔT/ΔH, near the Néel temperature, of the order ten times higher than that observed for Tb bulk. On the other hand, for small values of the magnetic field, large thickness effects are found. For external field strength around few kOe, we have found that the thermal caloric efficiency increases remarkably for ultrathin films. For an ultrathin film with 6 monolayers, we have found ΔT/ΔH = 43 K/T while for thicker films, with 20 monolayers, ΔT/ΔH = 22 K/T. Our results suggest that thin films of Tb are a promising material for magnetocaloric effect devices for applications at intermediate temperatures	pt_BR
dc.identifier.citation	MELLO, V.D.; ANSELMO, D.H.A.L.; VASCONCELOS, M.S.; ALMEIDA, N.S.. Magnetocaloric effect of thin Terbium films. Solid State Communications, [s.l.], v. 268, p. 56-60, dez. 2017. Disponível em: https://www.sciencedirect.com/science/article/pii/S0038109817302879?via%3Dihub. Acesso em: 03 Jun 2020. http://dx.doi.org/10.1016/j.ssc.2017.09.004.	pt_BR
dc.identifier.doi	10.1016/j.ssc.2017.09.004
dc.identifier.issn	0038-1098
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29133
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Magnetocaloric effect	pt_BR
dc.subject	Rare earth	pt_BR
dc.subject	Magnetic measurements	pt_BR
dc.subject	Thin films	pt_BR
dc.title	Magnetocaloric effect of thin Terbium films	pt_BR
dc.type	article	pt_BR