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Simulated magnetization configurations in -shaped elements for (a) positive and (b) negative AV core polarization. The dotted arrows in (a) depict the directions of the exciting current at which the -value of the AV is zero or two. The solid black and white arrows indicate the direction of the in-plane magnetization. The height denotes the -component of the magnetization. The inset illustrates a plain view of the AV with four current contacts.
[(a)–(d)] Micromagnetic simulations and [(e)–(h)] sketches of the different stages of simultaneous current and field induced AV-core switching. [(a) and (e)] A region of inverted out-of-plane magnetization (dip) is formed. [(b) and (f)] The dip (D) decays into a new AV and a vortex of polarizations opposite to the original AV. [(c) and (g)] The vortex and the original AV meet and [(d) and (h)] annihilate shortly thereafter by emitting spin waves. The arrows in (h) denote the wave vectors of the spin waves.
Simulated write and read processes of AV cores. Red solid (blue dotted) lines and red asterisks (blue crosses) illustrate a negative (positive) core polarization . (a) The AV core with polarization is transformed into an AV with polarization in dependence on the current direction described by the -value. (b) The large square in the center of the AV element marks the area shown in (a) and the small square marks the area of the inductive loop used to calculate the voltage signals in (c). The current direction for the read process is denoted by and the current direction for the write process by and by . (c) The crosses denote the voltage induced in a coil 20 nm above the sample’s surface for and the fits represent the first harmonic of the AV gyration. The crosses in the inset show the maximum voltage for different distances between coil and sample, the lines are guides to the eyes.
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