Off-axis electron holographic mapping of magnetic domains in Nd 2Fe14B

Martha McCartney, Yimei Zhu

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Off-axis electron holography employing a field-free Lorentz lens has been used to provide direct imaging of magnetic induction in Nd2Fe 14B with nanometer-scale resolution and high signal-to-noise. Using this technique, reconstructed phase images have been used to measure domain wall widths for 90° and 180° walls in a sintered sample were measured to be no greater than 7 and 9 nm, respectively. Induction maps show an unusual array of 90° domains in a hot-press sample, with singularities at the intersections of the domains. In situ thermal annealing of the hot-pressed sample resulted in magnetization rotation accompanied by domain wall movement and evidence for pinning at a structural defect. Heating of the sample above 400°C resulted in the accumulation of small particles in thin regions and decrease in magnetic contrast.

Original languageEnglish (US)
Pages (from-to)6414-6416
Number of pages3
JournalJournal of Applied Physics
Volume83
Issue number11
StatePublished - 1998

Fingerprint

magnetic domains
domain wall
electrons
magnetic induction
holography
intersections
induction
lenses
magnetization
annealing
heating
defects

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Off-axis electron holographic mapping of magnetic domains in Nd 2Fe14B. / McCartney, Martha; Zhu, Yimei.

In: Journal of Applied Physics, Vol. 83, No. 11, 1998, p. 6414-6416.

Research output: Contribution to journalArticle

@article{d86c579866154269941c2c59d7991214,
title = "Off-axis electron holographic mapping of magnetic domains in Nd 2Fe14B",
abstract = "Off-axis electron holography employing a field-free Lorentz lens has been used to provide direct imaging of magnetic induction in Nd2Fe 14B with nanometer-scale resolution and high signal-to-noise. Using this technique, reconstructed phase images have been used to measure domain wall widths for 90° and 180° walls in a sintered sample were measured to be no greater than 7 and 9 nm, respectively. Induction maps show an unusual array of 90° domains in a hot-press sample, with singularities at the intersections of the domains. In situ thermal annealing of the hot-pressed sample resulted in magnetization rotation accompanied by domain wall movement and evidence for pinning at a structural defect. Heating of the sample above 400°C resulted in the accumulation of small particles in thin regions and decrease in magnetic contrast.",
author = "Martha McCartney and Yimei Zhu",
year = "1998",
language = "English (US)",
volume = "83",
pages = "6414--6416",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "11",

}

TY - JOUR

T1 - Off-axis electron holographic mapping of magnetic domains in Nd 2Fe14B

AU - McCartney, Martha

AU - Zhu, Yimei

PY - 1998

Y1 - 1998

N2 - Off-axis electron holography employing a field-free Lorentz lens has been used to provide direct imaging of magnetic induction in Nd2Fe 14B with nanometer-scale resolution and high signal-to-noise. Using this technique, reconstructed phase images have been used to measure domain wall widths for 90° and 180° walls in a sintered sample were measured to be no greater than 7 and 9 nm, respectively. Induction maps show an unusual array of 90° domains in a hot-press sample, with singularities at the intersections of the domains. In situ thermal annealing of the hot-pressed sample resulted in magnetization rotation accompanied by domain wall movement and evidence for pinning at a structural defect. Heating of the sample above 400°C resulted in the accumulation of small particles in thin regions and decrease in magnetic contrast.

AB - Off-axis electron holography employing a field-free Lorentz lens has been used to provide direct imaging of magnetic induction in Nd2Fe 14B with nanometer-scale resolution and high signal-to-noise. Using this technique, reconstructed phase images have been used to measure domain wall widths for 90° and 180° walls in a sintered sample were measured to be no greater than 7 and 9 nm, respectively. Induction maps show an unusual array of 90° domains in a hot-press sample, with singularities at the intersections of the domains. In situ thermal annealing of the hot-pressed sample resulted in magnetization rotation accompanied by domain wall movement and evidence for pinning at a structural defect. Heating of the sample above 400°C resulted in the accumulation of small particles in thin regions and decrease in magnetic contrast.

UR - http://www.scopus.com/inward/record.url?scp=0032097320&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032097320&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0032097320

VL - 83

SP - 6414

EP - 6416

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 11

ER -