Disorder-induced time effect in the antiferromagnetic domain state of Fe1+yTe

Fikáček, Jan; Warmuth, Jonas; Arnold, Fabian; Piamonteze, Cinthia; Mao, Zhiqiang; Holý, Václav; Hofmann, Philip; Bremholm, Martin; Wiebe, Jens; Wiesendanger, Roland; Honolka, Jan

doi:10.1016/j.jmmm.2021.168426

Title: Disorder-induced time effect in the antiferromagnetic domain state of Fe_1+yTe

Journal Article · Wed Aug 18 00:00:00 EDT 2021 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2021.168426· OSTI ID:1977329

^[1]; Warmuth, Jonas ^[2]; Arnold, Fabian ^[3]; Piamonteze, Cinthia ^[4]; Mao, Zhiqiang ^[5]; Holý, Václav ^[6]; Hofmann, Philip ^[3]; Bremholm, Martin ^[3]; Wiebe, Jens ^[2]; Wiesendanger, Roland ^[2];

^[1]

Czech Academy of Sciences (CAS), Prague (Czech Republic). Institute of Physics
Univ. of Hamburg (Germany)
Aarhus Univ. (Denmark)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Pennsylvania State Univ., University Park, PA (United States)
Charles Univ., Prague (Czech Republic)

Herein 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 Fe_1+yTe (y ≈ 0.12). X-ray magnetic linear dichroism (XMLD) signals, which sense magnetic ordering processes at surfaces, start to increase monotonically below the Néel temperature T_N = 57 K. This increase is due to a progressive bicollinear antiferromagnetic (AFM) alignment of Fe spins of the monoclinic Fe_1+yTe parent phase. This AFM alignment was achieved by a [1 0 0]-oriented biasing field favoring a single-domain state during cooling across T_N. 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. The initial XMLD signal is restored only upon repeating a cycle consisting of heating and field-cooling through T_N. We explain the time effect by a gradual formation of a multi-domain state with 90° rotated AFM domains, promoted by structural disorder, facilitating the motion of twin-domains. Significant disorder in our Fe_1+yTe sample is evident from our X-ray diffraction and specific heat data. The stability of magnetic phases in Fe-chalcogenides is an important material property, since the Fe(Te_1-xSe_x) phase diagram shows magnetism intimately connected with superconductivity.

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Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Czech Science Foundation; German Research Foundation (DFG)

Grant/Contract Number:: SC0019068; 19-13659S; HO 5150/1-2; WI 3097/2-2

OSTI ID:: 1977329

Journal Information:: Journal of Magnetism and Magnetic Materials, Vol. 540, Issue C; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Disorder-induced time effect in the antiferromagnetic domain state of Fe1+yTe

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Title: Disorder-induced time effect in the antiferromagnetic domain state of Fe_1+yTe