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Helical magnetic ordering in thin FeGe membranes

DOI: 10.1103/PhysRevB.100.184403 DOI Help

Authors: D. M. Burn (Diamond Light Source) , S. L. Zhang (ShanghaiTech University; University of Oxford) , S. Wang (High Magnetic Field Laboratory, Chinese Academy of Sciences; University of Science and Technology of China) , H. F. Du (High Magnetic Field Laboratory, Chinese Academy of Sciences; University of Science and Technology of China) , Gerrit Van Der Laan (Diamond Light Source) , T. Hesjedal (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 100

State: Published (Approved)
Published: November 2019
Diamond Proposal Number(s): 20437

Abstract: A detailed magnetic phase diagram of FeGe membranes with fields applied out-of-plane is determined using small-angle soft x-ray elastic scattering. In addition to the well-established skyrmion and helical phase, we identify an additional ordered phase which partly coexists with the helical phase in a pocket beneath the skyrmion phase. Furthermore, an evolution of the modulation wave vector, q , is observed when traversing the magnetic phase pocket. For the ordinary and the additional helical phase, q only varies with normalized field but not with temperature—in sharp contrast to the skyrmion phase, for which q is both field and temperature dependent. This study of the helical phases in thin FeGe membranes lays the foundation for their use in future magnetic storage and logic devices.

Subject Areas: Materials, Physics


Instruments: I10-Beamline for Advanced Dichroism