Abstract
Abstract
The table-like behavior of the magnetic entropy change is generally observed in rare-earth-based alloys (e.g. La(Fe,Si)13, Gd50Co45Fe5, Gd56Ni15Al27Zr2, Gd
(
1
−
x
−
y
)
Co
x
Al
y
etc). Here, we report similar table-like behavior in a bulk perovskite Eu0.5Sr0.5MnO3–EuMnO3 composite system with a working temperature span of ∼80 K for a field change of ∼70 kOe. AC susceptibility and time-dependent DC magnetization relaxation measurements confirm the presence of interacting ferromagnetic clusters with a Vogel–Fulcher freezing temperature of
T
0
∼
42.7 K. The Langevin function fittings of the isothermal magnetization curves show a non-monotonous variation of cluster size with temperature. We propose a model for the high-field dependency of the ferromagnetic cluster coupling in the composite system. This widens the transition temperature region of long-range order formation and hence gives rise to the table-like magnetocaloric effect in Eu0.5Sr0.5MnO3–EuMnO3 composite systems.
Funder
Royal Academy of Engineering Chair in Emerging Technologies Grant
DST Inspire Fellowship
PMRF
SERB-SRG
European Union’s Horizon 2020 research and innovation program Be- MAGIC under the Marie Sklodowska-Curie Grant
Indian Institute of Science Education and Research Thiruvananthapuram
European Research Council ERC Advanced, EROS.
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials