La-Fe-Si-based alloys are among the most application-ready magnetocaloric materials for room-temperature magnetic refrigeration. Powder metallurgy methods have been previously demonstrated to successfully produce structures with sub-mm features for magnetic refrigerators in a scalable method. In this work, we explore the rotating magnetocaloric effect (RMCE) present in a 0.27 mm thin plate of sintered and hydrogenated La(Fe,Mn,Si)13. The high aspect ratio (∼50) of the thin plate leads to an anisotropic magnetocaloric effect (MCE), dependent on the relative orientation of the external magnetic field, and an RMCE when the external field is rotated. We find a maximum rotating adiabatic temperature change (ΔTadrot) of 1.17 K with the rotation of a 1 T magnetic field and 1.12 K when rotating a 0.6 T magnetic field, a reduction of only 4% for a 40% reduction in applied field strength. Magnetostatic computations revealed a considerable rotating isothermal entropy change (ΔSisorot), comparable to the conventional MCE of Gd for similar fields, reaching 3.97 J K−1 kg−1 for 1 T and 3.68 J K−1 kg−1 for 0.6 T (7% reduction), highlighting La-Fe-Mn-Si alloys as high potential candidates for a magnetic refrigerator based on the RMCE utilizing relatively low external magnetic field amplitudes, such as 0.6 T.
@article{arxiv.2601.23056,
title = {Rotating Magnetocaloric Effect in Sintered La(Fe,Mn,Si)$_{13}$H$_z$ Plates},
author = {Rafael Almeida and Tomás Ventura and Ricardo Moura Costa Pinto and João Oliveira Silva and Konrad Loewe and Rodrigo Kiefe and João Sequeira Amaral and João Pedro Araújo and João Horta Belo},
journal= {arXiv preprint arXiv:2601.23056},
year = {2026}
}
Comments
15 pages, 8 figures. To be submitted for peer review