Experimental determination of ultra-sharp stray field distribution from a magnetic vortex core structure

TY - JOUR

T1 - Experimental determination of ultra-sharp stray field distribution from a magnetic vortex core structure

AU - Zhong, Hai

AU - Huang, Lei

AU - Wei, Dan

AU - Wang, Sumei

AU - Zhu, Yimei

AU - Yuan, Jun

PY - 2009/8

Y1 - 2009/8

N2 - The fine magnetic stray field from a vortex structure of micron-sized permalloy (Ni80Fe20) elements has been studied by high-resolution magnetic force microscopy. By systematically studying the width of the stray filed gradient distribution at different tip-to-sample distances, we show that the half-width at half-maximum (HWHM) of the signal from vortex core can be as narrow as similar to 21 nm at a closest tip-to-sample distance of 23 nm, even including the convolution effect of the finite size of the magnetic tip, a weak circular reverse component is found around the center of the magnetic vortex in the measured magnetic force microscope (MFM) signals, which can be attributed to the reverse magnetization around the vortex core. Successive micromagnetic and MFM imaging simulations show good agreements with our experimental results on the width of the stray field distribution. (C) 2009 Elsevier B.V. All rights reserved.

AB - The fine magnetic stray field from a vortex structure of micron-sized permalloy (Ni80Fe20) elements has been studied by high-resolution magnetic force microscopy. By systematically studying the width of the stray filed gradient distribution at different tip-to-sample distances, we show that the half-width at half-maximum (HWHM) of the signal from vortex core can be as narrow as similar to 21 nm at a closest tip-to-sample distance of 23 nm, even including the convolution effect of the finite size of the magnetic tip, a weak circular reverse component is found around the center of the magnetic vortex in the measured magnetic force microscope (MFM) signals, which can be attributed to the reverse magnetization around the vortex core. Successive micromagnetic and MFM imaging simulations show good agreements with our experimental results on the width of the stray field distribution. (C) 2009 Elsevier B.V. All rights reserved.

KW - Vortex core

KW - MFM

KW - Micromagnetic

KW - ATOMIC-FORCE MICROSCOPY

KW - TIP

UR - http://www.scopus.com/inward/record.url?scp=65149092381&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2009.01.027

DO - 10.1016/j.jmmm.2009.01.027

M3 - Letter

SN - 0304-8853

VL - 321

SP - L37-L40

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 15

ER -