Strain measurements from Nd2Fe14B grains in sintered magnets using artificial moiré fringes

Y. Murakami; T. T. Sasaki; T. Ohkubo; K. Hono

doi:10.1016/j.actamat.2015.08.058

Strain measurements from Nd₂Fe₁₄B grains in sintered magnets using artificial moiré fringes

Y. Murakami, T. T. Sasaki, T. Ohkubo, K. Hono

Quantum Sciences of Materials

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

Strain maps for Nd₂Fe₁₄B grains in Nd-Fe-B sintered magnets, representing elongation/contraction in the spacing of c planes, have been revealed by analyzing artificial moiré fringes in scanning transmission electron microscopy images. The strain maps were collected from several types of Nd₂Fe₁₄B grains in contact with metallic-Nd (m-Nd), Nd₂O₃, NdO_x, and thin grain boundary phases. A maximum value of strain of ∼1.2% was observed at a Nd₂Fe₁₄B/m-Nd interface. The magnitude of strain for the interfaces with Nd₂O₃ and NdO_x phases was 0.4-0.5%. The strain was negligible in the vicinity of the grain boundary phase. It appears that the observations are smaller than the theoretical values of strain that may cause a significant change in the magnetocrystalline anisotropy of the Nd₂Fe₁₄B phase.

Original language	English
Pages (from-to)	101-106
Number of pages	6
Journal	Acta Materialia
Volume	101
DOIs	https://doi.org/10.1016/j.actamat.2015.08.058
Publication status	Published - Dec 1 2015

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Access to Document

10.1016/j.actamat.2015.08.058

Cite this

@article{b531d9cedb034d4a9daae0053843283f,

title = "Strain measurements from Nd2Fe14B grains in sintered magnets using artificial moir{\'e} fringes",

abstract = "Strain maps for Nd2Fe14B grains in Nd-Fe-B sintered magnets, representing elongation/contraction in the spacing of c planes, have been revealed by analyzing artificial moir{\'e} fringes in scanning transmission electron microscopy images. The strain maps were collected from several types of Nd2Fe14B grains in contact with metallic-Nd (m-Nd), Nd2O3, NdOx, and thin grain boundary phases. A maximum value of strain of ∼1.2% was observed at a Nd2Fe14B/m-Nd interface. The magnitude of strain for the interfaces with Nd2O3 and NdOx phases was 0.4-0.5%. The strain was negligible in the vicinity of the grain boundary phase. It appears that the observations are smaller than the theoretical values of strain that may cause a significant change in the magnetocrystalline anisotropy of the Nd2Fe14B phase.",

author = "Y. Murakami and Sasaki, {T. T.} and T. Ohkubo and K. Hono",

note = "Funding Information: The authors are grateful to Mrs. Y. Kondo and N. Endo (JEOL Ltd.) for useful discussions on the analysis of the artificial moir{\'e} fringes produced in HAADF-STEM images. They are also grateful to Prof. A. Sakuma (Tohoku University) for useful discussions about the relationship between strain and magnetic anisotropy. The study on the strain measurements was partly supported by a Grant-in-aid from the Japan Society for the Promotion of Science (JSPS) ( 15H04112 ). Publisher Copyright: {\textcopyright} 2015 Acta Materialia Inc. All rights reserved.",

year = "2015",

month = dec,

day = "1",

doi = "10.1016/j.actamat.2015.08.058",

language = "English",

volume = "101",

pages = "101--106",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Strain measurements from Nd2Fe14B grains in sintered magnets using artificial moiré fringes

AU - Murakami, Y.

AU - Sasaki, T. T.

AU - Ohkubo, T.

AU - Hono, K.

N1 - Funding Information: The authors are grateful to Mrs. Y. Kondo and N. Endo (JEOL Ltd.) for useful discussions on the analysis of the artificial moiré fringes produced in HAADF-STEM images. They are also grateful to Prof. A. Sakuma (Tohoku University) for useful discussions about the relationship between strain and magnetic anisotropy. The study on the strain measurements was partly supported by a Grant-in-aid from the Japan Society for the Promotion of Science (JSPS) ( 15H04112 ). Publisher Copyright: © 2015 Acta Materialia Inc. All rights reserved.

PY - 2015/12/1

Y1 - 2015/12/1

N2 - Strain maps for Nd2Fe14B grains in Nd-Fe-B sintered magnets, representing elongation/contraction in the spacing of c planes, have been revealed by analyzing artificial moiré fringes in scanning transmission electron microscopy images. The strain maps were collected from several types of Nd2Fe14B grains in contact with metallic-Nd (m-Nd), Nd2O3, NdOx, and thin grain boundary phases. A maximum value of strain of ∼1.2% was observed at a Nd2Fe14B/m-Nd interface. The magnitude of strain for the interfaces with Nd2O3 and NdOx phases was 0.4-0.5%. The strain was negligible in the vicinity of the grain boundary phase. It appears that the observations are smaller than the theoretical values of strain that may cause a significant change in the magnetocrystalline anisotropy of the Nd2Fe14B phase.

AB - Strain maps for Nd2Fe14B grains in Nd-Fe-B sintered magnets, representing elongation/contraction in the spacing of c planes, have been revealed by analyzing artificial moiré fringes in scanning transmission electron microscopy images. The strain maps were collected from several types of Nd2Fe14B grains in contact with metallic-Nd (m-Nd), Nd2O3, NdOx, and thin grain boundary phases. A maximum value of strain of ∼1.2% was observed at a Nd2Fe14B/m-Nd interface. The magnitude of strain for the interfaces with Nd2O3 and NdOx phases was 0.4-0.5%. The strain was negligible in the vicinity of the grain boundary phase. It appears that the observations are smaller than the theoretical values of strain that may cause a significant change in the magnetocrystalline anisotropy of the Nd2Fe14B phase.

UR - http://www.scopus.com/inward/record.url?scp=84942521704&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84942521704&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2015.08.058

DO - 10.1016/j.actamat.2015.08.058

M3 - Article

AN - SCOPUS:84942521704

SN - 1359-6454

VL - 101

SP - 101

EP - 106

JO - Acta Materialia

JF - Acta Materialia

ER -

Strain measurements from Nd₂Fe₁₄B grains in sintered magnets using artificial moiré fringes

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this