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Title: Magnetocaloric effect of thin Terbium films
Authors: Anselmo, Dory Hélio Aires de Lima
Mello, V. D.
Vasconcelos, Manoel Silva de
Almeida, N. S.
Keywords: Magnetocaloric effect;Rare earth;Magnetic measurements;Thin films
Issue Date: Dec-2017
Publisher: Elsevier
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: Acesso em: 03 Jun 2020.
Portuguese Abstract: 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
ISSN: 0038-1098
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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