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Strong magnetocaloric effect induced by spin reorientation transitions in epitaxial Ho thin films
- Source :
- Physical Review B, Physical Review B, American Physical Society, 2020, 102, pp.134426. ⟨10.1103/physrevb.102.134426⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
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 N\'eel temperature, ${T}_{N}\ensuremath{\approx}130\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ were recorded for both in-plane and out-of-plane magnetic field orientations. A change in entropy, $\mathrm{\ensuremath{\Delta}}{S}_{M}$ of $\text{--}5\phantom{\rule{0.28em}{0ex}}\mathrm{J}/\mathrm{kg}\mathrm{K}$ was found near ${T}_{N}$ for an in-plane field orientation. A large change in $\mathrm{\ensuremath{\Delta}}{S}_{M}$ of \ensuremath{-}11.8 J/kg K due to a fan-helix spin transition at $T=90\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ 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 $\mathrm{\ensuremath{\Delta}}{S}_{M}(T)$ is found to be larger for the ``in- plane'' orientation by a factor of two.
- Subjects :
- Physics
[PHYS]Physics [physics]
Condensed matter physics
Spin transition
chemistry.chemical_element
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Magnetic field
Orientation (vector space)
Magnetization
chemistry
0103 physical sciences
Magnetic refrigeration
Antiferromagnetism
010306 general physics
0210 nano-technology
Holmium
Spin-½
Subjects
Details
- Language :
- English
- ISSN :
- 24699950 and 24699969
- Database :
- OpenAIRE
- Journal :
- Physical Review B, Physical Review B, American Physical Society, 2020, 102, pp.134426. ⟨10.1103/physrevb.102.134426⟩
- Accession number :
- edsair.doi.dedup.....fc648e3bbba402954e857c66f9616486