Role of Dy on the magnetic properties of orthorhombic DyFeO3

0560106 - ÚFM 2023 RIV US eng J - Journal Article
Biswas, B. - Michel, Veronica F. - Fjellvag, Oystein S. - Bimashofer, G. - Doebeli, M. - Jambor, Michal - Keller, L. - Mueller, E. - Ukleev, V. - Pomjakushina, E. - Singh, D. - Stuhr, U. - Vaz, C. A. F. - Lippert, T. - Schneider, Christof W.
Role of Dy on the magnetic properties of orthorhombic DyFeO3.
Physical Review Materials. Roč. 6, č. 7 (2022), č. článku 074401. ISSN 2475-9953. E-ISSN 2475-9953
Institutional support: RVO:68081723
Keywords : Antiferromagnetism * Binary alloys * Magnetic materials
OECD category: Materials engineering
Impact factor: 3.4, year: 2022
Method of publishing: Limited access
https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.6.074401

Orthoferrites are a class of magnetic materials with a magnetic ordering temperature above 600 K, predominant G-type antiferromagnetic ordering of the Fe-spin system and, depending on the rare-earth ion, a spin reorientation of the Fe spin taking place at lower temperatures. DyFeO3 is of particular interest since the spin reorientation is classified as a Morin transition with the transition temperature depending strongly on the Dy-Fe interaction. Here, we report a detailed study of the magnetic and structural properties of microcrystalline DyFeO3 powder and bulk single crystal using neutron diffraction and magnetometry between 1.5 and 450 K. We find that, while the magnetic properties of the single crystal are largely as expected, the powder shows strongly modified magnetic properties, including a modified spin reorientation and a smaller Dy-Fe interaction energy of the order of 10 mu eV. Subtle structural differences between powder and single crystal show that they belong to distinct magnetic space groups. In addition, the Dy ordering at 2 K in the powder is incommensurate, with a modulation vector of 0.0173(5) c*, corresponding to a periodicity of similar to 58 unit cells.
Permanent Link: https://hdl.handle.net/11104/0333286