Interface effect of magnetic properties in Ni nanoparticles with a hcp core and fcc shell structure

Seongmin Choo, Kyujoon Lee, Younghun Jo, Seon Mi Yoon, Jae Young Choi, Jea Young Kim, Jea Hoon Park, Kyoung Jin Lee, Jong Heun Lee, Myung Hwa Jung

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We have fabricated hexagonal close-packed (hcp) Ni nanoparticles covered by a face-centered cubic (fcc) Ni surface layer by polyol method. The magnetic properties have been investigated as a function of temperature and applied magnetic field. The magnetic behavior reveals that the system should be divided magnetically into three distinct phases with different origins. The fcc Ni phase on the shell contributes to the superparamagnetism through a wide temperature range up to 360 K. The hcp Ni phase at the core is associated with antiferromagnetic nature below 12 K. These observations are in good agreement with the X-ray absorption spectroscopy and magnetic circular dichroism measurements. In our particular case, the unique hcp core and fcc shell structure gives rise to an additional anomaly at 20 K in the zero-field-cooled magnetization curve. Its position is barely affected by the magnetic field but its structure disappears above 30 kOe, showing a metamagnetic transition in the magnetization versus magnetic field curve. This new phase originates from the magnetic exchange at the interface between the hcp and fcc Ni sublattices.

Original languageEnglish
Pages (from-to)6126-6130
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number7
DOIs
Publication statusPublished - 2011 Jul 1

Fingerprint

Magnetic Fields
Nanoparticles
Magnetic properties
Magnetic fields
magnetic properties
nanoparticles
Magnetization
X-Ray Absorption Spectroscopy
magnetic fields
Superparamagnetism
magnetization
X ray absorption spectroscopy
Temperature
Polyols
Dichroism
curves
Circular Dichroism
sublattices
dichroism
surface layers

Keywords

  • Core-Shell Structure
  • Fcc Ni Nanoparticles
  • Hcp Ni Nanoparticles
  • Magnetic Properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

Cite this

Interface effect of magnetic properties in Ni nanoparticles with a hcp core and fcc shell structure. / Choo, Seongmin; Lee, Kyujoon; Jo, Younghun; Yoon, Seon Mi; Choi, Jae Young; Kim, Jea Young; Park, Jea Hoon; Lee, Kyoung Jin; Lee, Jong Heun; Jung, Myung Hwa.

In: Journal of Nanoscience and Nanotechnology, Vol. 11, No. 7, 01.07.2011, p. 6126-6130.

Research output: Contribution to journalArticle

Choo, Seongmin ; Lee, Kyujoon ; Jo, Younghun ; Yoon, Seon Mi ; Choi, Jae Young ; Kim, Jea Young ; Park, Jea Hoon ; Lee, Kyoung Jin ; Lee, Jong Heun ; Jung, Myung Hwa. / Interface effect of magnetic properties in Ni nanoparticles with a hcp core and fcc shell structure. In: Journal of Nanoscience and Nanotechnology. 2011 ; Vol. 11, No. 7. pp. 6126-6130.
@article{5411aa85604a4e80b5ff09e45a32e5ba,
title = "Interface effect of magnetic properties in Ni nanoparticles with a hcp core and fcc shell structure",
abstract = "We have fabricated hexagonal close-packed (hcp) Ni nanoparticles covered by a face-centered cubic (fcc) Ni surface layer by polyol method. The magnetic properties have been investigated as a function of temperature and applied magnetic field. The magnetic behavior reveals that the system should be divided magnetically into three distinct phases with different origins. The fcc Ni phase on the shell contributes to the superparamagnetism through a wide temperature range up to 360 K. The hcp Ni phase at the core is associated with antiferromagnetic nature below 12 K. These observations are in good agreement with the X-ray absorption spectroscopy and magnetic circular dichroism measurements. In our particular case, the unique hcp core and fcc shell structure gives rise to an additional anomaly at 20 K in the zero-field-cooled magnetization curve. Its position is barely affected by the magnetic field but its structure disappears above 30 kOe, showing a metamagnetic transition in the magnetization versus magnetic field curve. This new phase originates from the magnetic exchange at the interface between the hcp and fcc Ni sublattices.",
keywords = "Core-Shell Structure, Fcc Ni Nanoparticles, Hcp Ni Nanoparticles, Magnetic Properties",
author = "Seongmin Choo and Kyujoon Lee and Younghun Jo and Yoon, {Seon Mi} and Choi, {Jae Young} and Kim, {Jea Young} and Park, {Jea Hoon} and Lee, {Kyoung Jin} and Lee, {Jong Heun} and Jung, {Myung Hwa}",
year = "2011",
month = "7",
day = "1",
doi = "10.1166/jnn.2011.4488",
language = "English",
volume = "11",
pages = "6126--6130",
journal = "Journal of Nanoscience and Nanotechnology",
issn = "1533-4880",
publisher = "American Scientific Publishers",
number = "7",

}

TY - JOUR

T1 - Interface effect of magnetic properties in Ni nanoparticles with a hcp core and fcc shell structure

AU - Choo, Seongmin

AU - Lee, Kyujoon

AU - Jo, Younghun

AU - Yoon, Seon Mi

AU - Choi, Jae Young

AU - Kim, Jea Young

AU - Park, Jea Hoon

AU - Lee, Kyoung Jin

AU - Lee, Jong Heun

AU - Jung, Myung Hwa

PY - 2011/7/1

Y1 - 2011/7/1

N2 - We have fabricated hexagonal close-packed (hcp) Ni nanoparticles covered by a face-centered cubic (fcc) Ni surface layer by polyol method. The magnetic properties have been investigated as a function of temperature and applied magnetic field. The magnetic behavior reveals that the system should be divided magnetically into three distinct phases with different origins. The fcc Ni phase on the shell contributes to the superparamagnetism through a wide temperature range up to 360 K. The hcp Ni phase at the core is associated with antiferromagnetic nature below 12 K. These observations are in good agreement with the X-ray absorption spectroscopy and magnetic circular dichroism measurements. In our particular case, the unique hcp core and fcc shell structure gives rise to an additional anomaly at 20 K in the zero-field-cooled magnetization curve. Its position is barely affected by the magnetic field but its structure disappears above 30 kOe, showing a metamagnetic transition in the magnetization versus magnetic field curve. This new phase originates from the magnetic exchange at the interface between the hcp and fcc Ni sublattices.

AB - We have fabricated hexagonal close-packed (hcp) Ni nanoparticles covered by a face-centered cubic (fcc) Ni surface layer by polyol method. The magnetic properties have been investigated as a function of temperature and applied magnetic field. The magnetic behavior reveals that the system should be divided magnetically into three distinct phases with different origins. The fcc Ni phase on the shell contributes to the superparamagnetism through a wide temperature range up to 360 K. The hcp Ni phase at the core is associated with antiferromagnetic nature below 12 K. These observations are in good agreement with the X-ray absorption spectroscopy and magnetic circular dichroism measurements. In our particular case, the unique hcp core and fcc shell structure gives rise to an additional anomaly at 20 K in the zero-field-cooled magnetization curve. Its position is barely affected by the magnetic field but its structure disappears above 30 kOe, showing a metamagnetic transition in the magnetization versus magnetic field curve. This new phase originates from the magnetic exchange at the interface between the hcp and fcc Ni sublattices.

KW - Core-Shell Structure

KW - Fcc Ni Nanoparticles

KW - Hcp Ni Nanoparticles

KW - Magnetic Properties

UR - http://www.scopus.com/inward/record.url?scp=84863015303&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863015303&partnerID=8YFLogxK

U2 - 10.1166/jnn.2011.4488

DO - 10.1166/jnn.2011.4488

M3 - Article

C2 - 22121671

AN - SCOPUS:84863015303

VL - 11

SP - 6126

EP - 6130

JO - Journal of Nanoscience and Nanotechnology

JF - Journal of Nanoscience and Nanotechnology

SN - 1533-4880

IS - 7

ER -