We experimentally demonstrate low-power-consumption vortex-core switching in magnetic nanodisks using tailored rotating magnetic fields that are produced with orthogonal and unipolar Gaussian-pulse currents. Optimal width of the orthogonal pulses and their time delay are found to be determined only by the angular eigenfrequency {\omega}_D for a given vortex-state disk of its polarization p, such that {\sigma} = 1/{\omega}_D and {\Delta}t = {\pi}p/2{\omega}_D, as studied from analytical and micromagnetic numerical calculations. The estimated optimal pulse parameters are in good agreements with the experimentally found results. This work provides a foundation for energy-efficient information recording in vortex-core cross-point architecture.
@article{arxiv.1010.3061,
title = {Polarization-selective vortex-core switching by orthogonal Gaussian-pulse currents},
author = {Young-Sang Yu and Ki-Suk Lee and Hyunsung Jung and Youn-Seok Choi and Myoung-Woo Yoo and Dong-Soo Han and Mi-Young Im and Peter Fischer and Sang-Koog Kim},
journal= {arXiv preprint arXiv:1010.3061},
year = {2011}
}