Abstract
We found novel dynamic properties of vortex gyrotropic motions in soft magnetic nanodots driven by oscillating in-plane magnetic fields. The elementary eigenmodes of the field-driven gyrotropic motions are found to be the two counterclockwise (CCW) and clockwise (CW) circularly rotating motions of a vortex core (VC) with respect to the corresponding CCW and CW circularly rotating fields ( <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</b> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">CCW</sub> and <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</b> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">CW</sub> ) of a certain angular frequency omega <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</b> . Owing to asymmetric resonance characteristics between the two orthogonal eigenmodes at omega <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</b> close to the vortex eigenfrequency omega <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">D</i> , the use of <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</b> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">CCW</sub> ( <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</b> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">CW</sub> ) with omega <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</b> ~ omega <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">D</i> allows us to selectively and reliably switch, with sufficiently low field strengths as small as ~ 10 Oe, only the upward (downward) oriented VC to its downward (upward) one. The results promise a reliable, low-power, and effective means of information storage, recording, and readout, representing an advanced step toward realizing a new class of vortex-based random access memory (VRAM) devices.
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