Disorder-induced time effect in the antiferromagnetic domain state of Fe.sub.1+y./sub.Te

0546186 - FZÚ 2022 RIV NL eng J - Článek v odborném periodiku
Fikáček, Jan - Warmuth, J. - Arnold, F. - Piamonteze, C. - Mao, Z. - Holý, V. - Hofmann, P. - Bremholm, M. - Wiebe, J. - Wiesendanger, R. - Honolka, Jan
Disorder-induced time effect in the antiferromagnetic domain state of Fe_1+yTe.
Journal of Magnetism and Magnetic Materials. Roč. 540, Dec. (2021), č. článku 168426. ISSN 0304-8853. E-ISSN 1873-4766
Grant CEP: GA ČR GA19-13659S
Institucionální podpora: RVO:68378271
Klíčová slova: iron chalcogenides * antiferromagnetism * X-ray magnetic linear dichroism * domain structure
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.097, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.jmmm.2021.168426

We report on temperature-dependent soft X-ray absorption spectroscopy (XAS) measurements utilizing linearly polarized synchrotron radiation to probe magnetic phase transitions in iron-rich Fe1+yTe (y ≈ 0.12). X-ray magnetic linear dichroism (XMLD) signals, which sense magnetic ordering processes at surfaces, start to increase monotonically below the N´eel temperature TN = 57 K. This increase is due to a progressive bicollinear antiferromagnetic (AFM) alignment of Fe spins of the monoclinic Fe1+yTe parent phase. This AFM alignment was achieved by a [100]-oriented biasing field favoring a single-domain state during cooling across TN. Our specific heat and magnetization measurements confirm the bulk character of this AFM phase transition. On longer time scales, however, we observe that the field-biased AFM state is highly unstable even at the lowest temperature of T = 3 K. After switching off the biasing field, the XMLD signal decays exponentially with a time constant τ = 1506 s.
Trvalý link: http://hdl.handle.net/11104/0322790