Print Email Facebook Twitter Moment evolution across the ferromagnetic phase transition of giant magnetocaloric (Mn,Fe)2(P,Si,B) compounds Title Moment evolution across the ferromagnetic phase transition of giant magnetocaloric (Mn,Fe)2(P,Si,B) compounds Author Yibole, H. Guillou, F. Caron, L. Jimenez, E. De Groot, F.M.F. Roy, P. De Groot, R. Van Dijk, N.H. Brück, E. Faculty Applied Sciences Department RST/Radiation, Science and Technology Date 2015-01-23 Abstract A strong electronic reconstruction resulting in a quenching of the Fe magnetic moments has recently been predicted to be at the origin of the giant magnetocaloric effect displayed by Fe2P-based materials. To verify this scenario, x-ray magnetic circular dichroism experiments have been carried out at the L edges of Mn and Fe for two typical compositions of the (Mn,Fe)2(P,Si,B) system. The dichroic absorption spectra of Mn and Fe have been measured in the vicinity of the first-order ferromagnetic transition. The experimental spectra are compared with first-principles calculations and charge-transfer multiplet simulations in order to derive the magnetic moments. Even though signatures of a metamagnetic behavior are observed either as a function of the temperature or the magnetic field, the similarity of the Mn and Fe moment evolution suggests that the quenching of the Fe moment is weaker than previously predicted. To reference this document use: http://resolver.tudelft.nl/uuid:aeacb87a-5fe8-44c6-9a69-fe4c708f48b7 DOI https://doi.org/10.1103/PhysRevB.91.014429 Publisher American Physical Society ISSN 1098-0121 Source http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.014429 Source Physical Review B, 91 (1), 2015 Part of collection Institutional Repository Document type journal article Rights © 2015 American Physical Society Files PDF Yibole_2015.pdf 1023.47 KB Close viewer /islandora/object/uuid:aeacb87a-5fe8-44c6-9a69-fe4c708f48b7/datastream/OBJ/view