Determining the magnetic modulation and phase diagram of skyrmion-hosting magnetic multilayers by SANS
In magnetic skyrmion research, SANS is a well-known and pivotal probe of skyrmions in bulk chiral magnets like MnSi. Surprisingly, SANS is scarcely applied to study spirals and skyrmions in the huge class of synthetic host systems, most importantly in magnetic multilayers (MML) with repetitions of ferromagnet (FM) and heavy-metal layers. Here we propose a D33 unpolarized (4 days) and polarized (2 days) SANS study of the MMLs |Ta10|Pt8|(CoFeB0.8|Ru1.2|Pt0.6)xN|Pt2, with N=20,40 the repetition number, and other numbers denote thickness in nm. Using PolSANS our goal is to determine an average rotation sense of the spiral and skyrmion modulations across the entire MML, this being a first for this class of system. These data will complement recent X-ray magnetic scattering (XRMS) experiments that probe only the top few layers of the MML. Using unpolarised SANS the goal is to provide a first exploration of the microscopic magnetic field versus temperature (T) phase diagram below room T. The anticipated results will allow parameterization of critical interactions such as the DMI over an entire MML, and not just the top few layers of the MML that have been studied up to now.
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WHITE Jonathan; AJEJAS BAZAN Fernando; CROS Vincent; CUBITT Robert; DEWHURST Charles; N. Reyren and UKLEEV Victor. (2020). Determining the magnetic modulation and phase diagram of skyrmion-hosting magnetic multilayers by SANS. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-54-305
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