Wednesday, April 3, 2013

1304.0040 (Shi-Zeng Lin et al.)

Manipulation of skyrmions in nanodisks with a current pulse and skyrmion
rectifier
   [PDF]

Shi-Zeng Lin, Charles Reichhardt, Avadh Saxena
Skyrmions stabilized in certain chiral magnets are very promising for applications in information storage. A skyrmion in a nanosized disk can be used as a bit of information. To this end, the controlled creation and removal of a skyrmion only by a current but without external magnetic fields are desirable. Here we propose to create a skyrmion by a current pulse in a nanodisk with uniaxial anisotropy through destabilization of the ferromagnetic state. After the current pulse is applied, a skyrmion is created and stabilized inside the disk. The skyrmion can be removed from the disk by applying a dc current. We also show that the novel dynamics of the created skyrmion can lead to a rectification effect, in which a dc voltage is generated by the motion of skyrmion in the presence of an ac driving current.
View original: http://arxiv.org/abs/1304.0040

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