Magnetic Yoking and Tunable Interactions in FePt-Based Hard/Soft Bilayers
arXiv:1608.04630 · doi:10.1038/srep32842
Abstract
Assessing and controlling magnetic interactions in magnetic nanostructures are critical to nanomagnetic and spintronic explorations, such as magnetic recording media, permanent magnets, magnetic memory and logic devices, etc. Here we demonstrate an extremely sensitive magnetic yoking effect and tunable interactions in FePt based hard/soft bilayers mediated by the soft layer. Below the exchange length, a thin soft layer strongly exchange couples to the perpendicular moments of the hard layer; above the exchange length, just a few nanometers thicker, the soft layer moments turn in-plane and act to yoke the dipolar fields from the adjacent hard layer perpendicular domains. The evolution from exchange to dipolar-dominated interactions is experimentally captured by first-order reversal curves, the delta-M method, and polarized neutron reflectometry, and confirmed by micromagnetic simulations. These findings demonstrate an effective yoking approach to design and control magnetic interactions in wide varieties of magnetic nanostructures and devices.
arXiv comment24 pages, 5 figures, plus 3-page supplementary information
References in corpus (11)
- Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
- Spectral analysis of topological defects in an artificial spin-ice lattice
- Quantitative Decoding of Interactions in Tunable Nanomagnet Arrays Using First Order Reversal Curves
- Magnetic Fingerprints of sub-100 nm Fe Nanodots
- Anisotropy Dependence of Irreversible Switching in Fe/SmCo and FeNi/FePt Exchange Spring Magnet Films
- Vertically Graded Anisotropy in Co/Pd Multilayers
- Perpendicular Magnetization and Generic Realization of the Ising Model in Artificial Spin Ice
- Controlling magnetization reversal in Co/Pt nanostructures with perpendicular anisotropy
- Probing the A1 to L10 Transformation in FeCuPt Using the First Order Reversal Curve Method
- Frustration Driven Stripe Domain Formation in Co/Pt Multilayer Films
- Accessing Different Spin-Disordered States using First Order Reversal Curves
Cited by in corpus (6)
- Growth-Induced In-Plane Uniaxial Anisotropy in VO/Ni Films
- Three-Dimensional Structure of Hybrid Magnetic Skyrmions Determined by Neutron Scattering
- Magnetization reversal in Kagome artificial spin ice studied by first-order reversal curves
- Skyrmion-Excited Spin Wave Fractal Network
- Origin of exchange bias in [Co/Pt]ML/Fe multilayer with orthogonal magnetic anisotropies
- Controlling magnetic configuration in soft-hard bilayers probed by polarized neutron reflectometry