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Strong magnetocaloric effect induced by spin reorientation transitions in epitaxial Ho thin films

Abstract : Magnetocaloric effect (MCE) in an antiferromagnetic holmium (Ho) film is studied near the spin reorientation temperatures. A series of magnetization isotherms from 60 to 150 K around the Néel temperature, T N ≈ 130 K were recorded for both in-plane and out-of-plane magnetic field orientations. A change in entropy, S M of-5 J/kgK was found near T N for an in-plane field orientation. A large change in S M of −11.8 J/kg K due to a fan-helix spin transition at T = 90 K is observed for an in-plane field orientation. Spin transition at both T N and at the fan-helix transition exhibit larger MCE in the in-plane field orientations in comparison with the perpendicular orientation. The value of the refrigerant capacity extracted from the temperature dependence of S M (T) is found to be larger for the "in-plane" orientation by a factor of two.
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https://hal.univ-lorraine.fr/hal-03042896
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Submitted on : Monday, December 7, 2020 - 8:53:23 AM
Last modification on : Monday, December 21, 2020 - 3:32:04 PM

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O. Koplak, R. Morgunov, R. Medapalli, E. Fullerton, S Mangin. Strong magnetocaloric effect induced by spin reorientation transitions in epitaxial Ho thin films. Physical Review B, American Physical Society, 2020, 102, pp.134426. ⟨10.1103/physrevb.102.134426⟩. ⟨hal-03042896⟩

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