Magnetic properties of Ni nanoparticles on microporous silica spheres

Jeffrey F. Godsell; Keith P. Donegan; Joseph M. Tobin; Mark P. Copley; Fernando M.F. Rhen; David J. Otway; Michael A. Morris; Terence O'Donnell; Justin D. Holmes; Saibal Roy

doi:10.1016/j.jmmm.2009.06.075

Magnetic properties of Ni nanoparticles on microporous silica spheres

Jeffrey F. Godsell, Keith P. Donegan, Joseph M. Tobin, Mark P. Copley, Fernando M.F. Rhen, David J. Otway, Michael A. Morris, Terence O'Donnell, Justin D. Holmes, Saibal Roy

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

Abstract

Ni nanoparticles (~32 nm particle diameter) have been synthesized on the walls of microporous (~1 nm pore diameter) silica spheres (~2.6 μm sphere diameter) and characterised magnetically to potentially produce a new class of core (silica micro-spheres)-shell (nanometallic)-type nanocomposite material. These magnetic nanocomposite materials display a characteristic increase in coercivity with reducing temperature. The average particle size has been used to calculate the anisotropy constant for the system, K. The discussion postulates the potential mechanisms contributing to the difference between the calculated K value and the magnetocrystalline anisotropy constant of bulk Ni. Various factors such as surface anisotropy and interparticle interactions are discussed as possible contributing factors to the anisotropy values calculated in the paper.

Original language	English
Pages (from-to)	1269-1274
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	322
Issue number	9-12
DOIs	https://doi.org/10.1016/j.jmmm.2009.06.075
Publication status	Published - May 2010
Externally published	Yes

Keywords

Magnetic nanocomposite
Microporous silica sphere
Ni nanoparticle
Silica sphere
Superparamagnetism

Access to Document

10.1016/j.jmmm.2009.06.075

Cite this

@article{5b3589b708f542efb65a01959c33cca5,

title = "Magnetic properties of Ni nanoparticles on microporous silica spheres",

abstract = "Ni nanoparticles (~32 nm particle diameter) have been synthesized on the walls of microporous (~1 nm pore diameter) silica spheres (~2.6 μm sphere diameter) and characterised magnetically to potentially produce a new class of core (silica micro-spheres)-shell (nanometallic)-type nanocomposite material. These magnetic nanocomposite materials display a characteristic increase in coercivity with reducing temperature. The average particle size has been used to calculate the anisotropy constant for the system, K. The discussion postulates the potential mechanisms contributing to the difference between the calculated K value and the magnetocrystalline anisotropy constant of bulk Ni. Various factors such as surface anisotropy and interparticle interactions are discussed as possible contributing factors to the anisotropy values calculated in the paper.",

keywords = "Magnetic nanocomposite, Microporous silica sphere, Ni nanoparticle, Silica sphere, Superparamagnetism",

author = "Godsell, {Jeffrey F.} and Donegan, {Keith P.} and Tobin, {Joseph M.} and Copley, {Mark P.} and Rhen, {Fernando M.F.} and Otway, {David J.} and Morris, {Michael A.} and Terence O'Donnell and Holmes, {Justin D.} and Saibal Roy",

year = "2010",

month = may,

doi = "10.1016/j.jmmm.2009.06.075",

language = "English",

volume = "322",

pages = "1269--1274",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

number = "9-12",

}

TY - JOUR

T1 - Magnetic properties of Ni nanoparticles on microporous silica spheres

AU - Godsell, Jeffrey F.

AU - Donegan, Keith P.

AU - Tobin, Joseph M.

AU - Copley, Mark P.

AU - Rhen, Fernando M.F.

AU - Otway, David J.

AU - Morris, Michael A.

AU - O'Donnell, Terence

AU - Holmes, Justin D.

AU - Roy, Saibal

PY - 2010/5

Y1 - 2010/5

N2 - Ni nanoparticles (~32 nm particle diameter) have been synthesized on the walls of microporous (~1 nm pore diameter) silica spheres (~2.6 μm sphere diameter) and characterised magnetically to potentially produce a new class of core (silica micro-spheres)-shell (nanometallic)-type nanocomposite material. These magnetic nanocomposite materials display a characteristic increase in coercivity with reducing temperature. The average particle size has been used to calculate the anisotropy constant for the system, K. The discussion postulates the potential mechanisms contributing to the difference between the calculated K value and the magnetocrystalline anisotropy constant of bulk Ni. Various factors such as surface anisotropy and interparticle interactions are discussed as possible contributing factors to the anisotropy values calculated in the paper.

AB - Ni nanoparticles (~32 nm particle diameter) have been synthesized on the walls of microporous (~1 nm pore diameter) silica spheres (~2.6 μm sphere diameter) and characterised magnetically to potentially produce a new class of core (silica micro-spheres)-shell (nanometallic)-type nanocomposite material. These magnetic nanocomposite materials display a characteristic increase in coercivity with reducing temperature. The average particle size has been used to calculate the anisotropy constant for the system, K. The discussion postulates the potential mechanisms contributing to the difference between the calculated K value and the magnetocrystalline anisotropy constant of bulk Ni. Various factors such as surface anisotropy and interparticle interactions are discussed as possible contributing factors to the anisotropy values calculated in the paper.

KW - Magnetic nanocomposite

KW - Microporous silica sphere

KW - Ni nanoparticle

KW - Silica sphere

KW - Superparamagnetism

UR - http://www.scopus.com/inward/record.url?scp=77949279549&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2009.06.075

DO - 10.1016/j.jmmm.2009.06.075

M3 - Article

AN - SCOPUS:77949279549

SN - 0304-8853

VL - 322

SP - 1269

EP - 1274

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 9-12

ER -

Magnetic properties of Ni nanoparticles on microporous silica spheres

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this