Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

High Spatial Resolution Quantitative Micromagnetics

Published

Author(s)

M Scheinfein, John Unguris, Daniel T. Pierce, Robert Celotta

Abstract

Magnetization profiles at surfaces are observed with scanning electron microscopy with polarization analysis (SEMPA). This technique allows for quantitative analysis of the vector magnetization profile with 70 nm spatial resolution. Magnetization profiles in surface Neacute}el walls which terminate bulk 180° Bloch walls at surfaces have been calculated by solving the micromagnetic equations using energy minimization. The micromagnetic calculations show that the surface Neacute}el wall penetrates a distance from the surface comparable to a Bloch wall width and that the surface Neacute}el wall width is at least twice the bulk Bloch wall width. The dependence of the domain wall magnetization on sample thickness is calculated for Fe, and model predictions of the wall widths that would be determined by transmission Lorentz microscopy are compared with the experimental results. The magnetic field outside of the sample, which gives rise to contrast with the Bitter technique and magnetic force microscopy (MFM), is a complicated superposition of contributions from both bulk and surface walls. Moreover, a strong mutual interaction between the sample and the MFM tip may alter the sample magnetization.
Citation
Journal of Applied Physics
Volume
67
Issue
9

Citation

Scheinfein, M. , Unguris, J. , Pierce, D. and Celotta, R. (1990), High Spatial Resolution Quantitative Micromagnetics, Journal of Applied Physics (Accessed October 31, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created December 31, 1989, Updated October 12, 2021