Chiral Spin Bobbers in Exchange-Coupled Hard-Soft Magnetic Bilayers
arXiv:2111.09183 · doi:10.1016/j.jmmm.2022.169627
Abstract
The spin structure of exchange-coupled MnBi:Co-Fe bilayers is investigated by X-ray magnetic circular dichroism (XMCD), polarized neutron reflectometry (PNR), and micromagnetic simu-lations. The purpose of the present research is two-fold. First, the current search for new permanent-magnet materials includes hard-soft nanocomposites, and the analysis of coercivity mechanisms in these structures is an important aspect of this quest. Second, topological micro-magnetic structures such as skyrmions have recently become of intense fundamental and applied research, for example in the context of spin-based electronics. We find that the magnetization reversal of the MnBi:Co-Fe bilayer structure involves a curling-type twisting of the magnetization in the film plane. This curling in the exchange-coupled hard-soft magnetic bilayers is reminiscent of chiral spin structures known as bobbers and, in fact, establishes a new type of skyrmionic spin structure.
References in corpus (15)
- Berry Phase Effects on Electronic Properties
- The design and verification of Mumax3
- Magnetic vortex oscillator driven by dc spin-polarized current
- Spin-orbit torques induced by interface-generated spin currents
- Large microwave generation from d.c. driven magnetic vortex oscillators in magnetic tunnel junctions
- Experimental observation of magnetic bobbers for a new concept of magnetic solid-state memory
- New type of stable particle like states in chiral magnets (Chiral bobbers)
- Tuning a binary ferromagnet into a multi-state synapse with spin-orbit torque induced plasticity
- A Frequency-Controlled Magnetic Vortex Memory
- Chiral Bobbers and Skyrmions in Epitaxial FeGe/Si(111) Films
- Homogeneous and heterogeneous nucleation of skyrmions in thin layers of cubic helimagnets
- Creation of a Chiral Bobber Lattice in Helimagnet-Multilayer Heterostructures
- Determination of the effective transverse coherence of the neutron wave packet as employed in reflectivity investigations of condensed matter structures Part I: Measurements
- Distinct magnetotransport and orbital fingerprints of chiral bobbers
- Vortex Dynamics-Mediated Low-Field Magnetization Switching in an Exchange-Coupled System