ORCID Profile
0000-0003-4666-1800
Current Organisation
University of California, Irvine
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Publisher: Elsevier BV
Date: 04-2010
Publisher: AIP Publishing
Date: 05-2010
DOI: 10.1063/1.3358233
Abstract: The effects of vortex chirality and shape anisotropy on the magnetization reversal of thin Co nanorings with and without slots have been investigated using off-axis electron holography and micromagnetic simulations. Stepped hysteresis loops were determined and typical well-defined states, including onion states, vortex states, flux-closure (FC) states, and omega (Ω) states were identified during reversal for different element shapes. The chirality of the vortex (vortices) formed after the onion states determined the switching mechanism. The Co nanorings and slotted rings with applied field parallel to the slots showed multistep switching via onion-FC-onion mode, also involving the formation and annihilation of vortex (vortices), whereas slotted rings with applied field perpendicular to the slots exhibited simple one-step switching by abrupt chirality reversal of the FC states. The influence of shape anisotropy on switching fields is also discussed in terms of demagnetization energy.
Publisher: American Chemical Society (ACS)
Date: 11-2016
Publisher: AIP Publishing
Date: 02-11-2009
DOI: 10.1063/1.3261753
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2009
Publisher: AIP Publishing
Date: 27-04-2009
DOI: 10.1063/1.3123290
Abstract: The remanent states and magnetization reversal mechanisms for nanopatterned Co/Cu/Py (Py=Permalloy) spin-valve elements with slotted-ring shapes have been studied using off-axis electron holography. The hysteresis loops of in idual elements were quantitatively determined for slots parallel to the applied field, indicating that three identifiably separate steps occurred during reversal. Magnetization configurations at each stage were directly visualized, suggesting that Co and Py layers undergo coherent switching from onion state to flux-closure state and finally to reverse onion state. The effective loop rotation direction for the Py layer was clockwise.
No related grants have been discovered for Kai He.