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

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, TN ≈ 130 K were recorded for both in-plane and out-of-plane magnetic field orientations. A chan...

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Bibliographic Details
Published in:Physical review. B 2020-10, Vol.102 (13), p.1, Article 134426
Main Authors: Koplak, O., Morgunov, R., Medapalli, R., Fullerton, E. E., Mangin, S.
Format: Article
Language:English
Subjects:
Antiferromagnetism
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Holmium
Magnetism
Materials Science
Orientation
Physics
Spin transition
Temperature dependence
Thin films
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Summary: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, TN ≈ 130 K were recorded for both in-plane and out-of-plane magnetic field orientations. A change in entropy, ΔSM of –5 J/kg K was found near TN for an in-plane field orientation. A large change in ΔSM 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 TN 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 ΔSM(T) is found to be larger for the "in- plane" orientation by a factor of two.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.134426