Large ordered moment with strong easy-plane anisotropy and vortex-domain pattern in the kagome ferromagnet Fe3Sn
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- Univ. of Augsburg (Germany)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Norwegian Univ. of Science and Technology, Trondheim (Norway)
- Moldova State University (Moldova)
- Romanian Academy, Iasi (Romania)
- Univ. of Augsburg (Germany); Moldova State University (Moldova)
We report the magnetic anisotropy of kagome bilayer ferromagnet Fe3Sn probed by the bulk magnetometry and magnetic force microscopy (MFM) on high-quality single crystals. The dependence of magnetization on the orientation of the external magnetic field reveals strong easyplane magnetocrystalline anisotropy and anisotropy of the saturation magnetization. The leading magnetocrystalline anisotropy constant shows a monotonous increase from $$\mathrm{K_1$$≈ –1.0 \times 10^6 J/m^3}$ at 300 K to $$\mathrm{–1.3 \times 10^6 J/m^3}$$ at 2 K. Our ab initio electronic structure calculations yield the value of total magnetic moment of 7.1$$μ_Β$$/$$f.u.$ and a magnetocrystalline anisotropy energy density of –0.57 $$\mathrm{meV/}$$$$f.u.$ $$\mathrm{(–1.62 \times 10^6J/m^3)}$$ both being in reasonable agreement with the experimental values. The MFM imaging reveals micrometer-scale magnetic vortices with weakly pinned cores that vanish at the saturation field of ~3T applied perpendicular to the kagome plane. The observed vortex-domain structure is well reproduced by the micromagnetic simulations, using the experimentally determined value of the anisotropy and exchange stiffness.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2007464
- Journal Information:
- Applied Physics Letters, Vol. 123, Issue 2; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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