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A brief discussion of the magnetocaloric effect in thin films of manganite doped with chromium

DOI: 10.1088/1742-6596/1247/1/012013 DOI Help

Authors: G. Campillo (Universidad de Medellín) , A. I. Figueroa (Diamond Light Source) , O. Arnache (Universidad de Antioquia) , J. Osorio (Universidad de Antioquia) , J. M. Marín Ramírez (Universidad de Antioquia) , L. Fallarino (Helmholtz-Zentrum Dresden-Rossendorf)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: 6th National Conference on Engineering Physics and the 1st International Conference on Applied Physics Engineering & Innovation
Peer Reviewed: No

State: Published (Approved)
Published: June 2019

Open Access Open Access

Abstract: In this work we report on the magnetocaloric effect of La2/3Ca1/3MnO3 (LCMO) and La2/3Ca1/3Mn0.94Cr0.06O3 (LCMCrO) manganite thin films grown by DC magnetron sputtering on LaAlO3 (100) substrates. X-ray diffraction shows that both doped and undoped films crystallize in the orthorhombic structure. Magnetic measurements show a decrease in both the Curie temperature, TC , and the saturation magnetization, MS , for the LCMCrO sample. The change in the magnetic entropy (ΔSm ) was extracted from hysteresis loops at different temperatures around the ferromagnetic to paramagnetic transition, displaying a maximum of entropy change (ΔSm ) max near TC in both films. Moreover, a shift in (ΔSm ) max toward temperatures above TC with increasing magnetic field and a broadening of the entropy change curve were observed. Results of refrigeration cooling power show a lower efficiency for LCMCrO. In order to obtain a local insight into the magnetic interactions of these films, measurements of X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) were performed. XMCD suggests that an antiferromagnetic coupling between Mn4+ - Mn3+ is favored with Cr3+ incorporation, which reduces the Mn L 2,3 XMCD signal and results in a decrease of MS and (ΔSm ) max in LCMCrO films.

Subject Areas: Materials, Physics

Instruments: B18-Core EXAFS

Other Facilities: 6.3.1 at Advanced Light Source

Added On: 28/11/2019 15:59


Discipline Tags:

Surfaces Physics Magnetism Materials Science interfaces and thin films

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)