Particle size dependence of exchange-bias and coercivity in CuO nanoparticles

M. S. Seehra; A. Punnoose

doi:10.1016/j.ssc.2003.08.029

Particle size dependence of exchange-bias and coercivity in CuO nanoparticles

M. S. Seehra
, A. Punnoose

Physics Department

West Virginia University

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

83 Scopus citations

Abstract

For CuO nanocrystals of size 6.6-37 nm, the exchange bias H_eb and coercivity H_c are measured at 5 K in zero-field-cooled (ZFC) and field-cooled (FC at 50kOe) samples and their variations investigated as a function of particle size D. The similar 1/D variations observed for the difference coercivity ΔH_c=H_c(FC)-H_c(ZFC) and the interfacial exchange energy Δσ=H_ebM_fD are discussed in terms of the ferromagnetic magnetization M_f being produced by the uncompensated surface Cu²⁺ spins in the otherwise antiferromagnetically ordered CuO nanoparticles. This leads to the observation that the experimentally measured ΔH_c provides a good measure of Δσ in nanoparticle systems, with H_eb/ΔH _c varying as 1/M_fD.

Original language	English
Pages (from-to)	299-302
Number of pages	4
Journal	Solid State Communications
Volume	128
Issue number	8
DOIs	https://doi.org/10.1016/j.ssc.2003.08.029
State	Published - Nov 2003

Keywords

A. Insulators
A. Magnetically ordered materials
B. Chemical synthesis
D. Exchange and superexchange

Access to Document

10.1016/j.ssc.2003.08.029

Cite this

@article{826fc2ddb4e346788851b4e264fb09d0,

title = "Particle size dependence of exchange-bias and coercivity in CuO nanoparticles",

abstract = "For CuO nanocrystals of size 6.6-37 nm, the exchange bias Heb and coercivity Hc are measured at 5 K in zero-field-cooled (ZFC) and field-cooled (FC at 50kOe) samples and their variations investigated as a function of particle size D. The similar 1/D variations observed for the difference coercivity ΔHc=Hc(FC)-Hc(ZFC) and the interfacial exchange energy Δσ=HebMfD are discussed in terms of the ferromagnetic magnetization Mf being produced by the uncompensated surface Cu2+ spins in the otherwise antiferromagnetically ordered CuO nanoparticles. This leads to the observation that the experimentally measured ΔHc provides a good measure of Δσ in nanoparticle systems, with Heb/ΔH c varying as 1/MfD.",

keywords = "A. Insulators, A. Magnetically ordered materials, B. Chemical synthesis, D. Exchange and superexchange",

author = "Seehra, \{M. S.\} and A. Punnoose",

year = "2003",

month = nov,

doi = "10.1016/j.ssc.2003.08.029",

language = "English",

volume = "128",

pages = "299--302",

number = "8",

}

TY - JOUR

T1 - Particle size dependence of exchange-bias and coercivity in CuO nanoparticles

AU - Seehra, M. S.

AU - Punnoose, A.

PY - 2003/11

Y1 - 2003/11

N2 - For CuO nanocrystals of size 6.6-37 nm, the exchange bias Heb and coercivity Hc are measured at 5 K in zero-field-cooled (ZFC) and field-cooled (FC at 50kOe) samples and their variations investigated as a function of particle size D. The similar 1/D variations observed for the difference coercivity ΔHc=Hc(FC)-Hc(ZFC) and the interfacial exchange energy Δσ=HebMfD are discussed in terms of the ferromagnetic magnetization Mf being produced by the uncompensated surface Cu2+ spins in the otherwise antiferromagnetically ordered CuO nanoparticles. This leads to the observation that the experimentally measured ΔHc provides a good measure of Δσ in nanoparticle systems, with Heb/ΔH c varying as 1/MfD.

AB - For CuO nanocrystals of size 6.6-37 nm, the exchange bias Heb and coercivity Hc are measured at 5 K in zero-field-cooled (ZFC) and field-cooled (FC at 50kOe) samples and their variations investigated as a function of particle size D. The similar 1/D variations observed for the difference coercivity ΔHc=Hc(FC)-Hc(ZFC) and the interfacial exchange energy Δσ=HebMfD are discussed in terms of the ferromagnetic magnetization Mf being produced by the uncompensated surface Cu2+ spins in the otherwise antiferromagnetically ordered CuO nanoparticles. This leads to the observation that the experimentally measured ΔHc provides a good measure of Δσ in nanoparticle systems, with Heb/ΔH c varying as 1/MfD.

KW - A. Insulators

KW - A. Magnetically ordered materials

KW - B. Chemical synthesis

KW - D. Exchange and superexchange

UR - https://www.scopus.com/pages/publications/0141929455

U2 - 10.1016/j.ssc.2003.08.029

DO - 10.1016/j.ssc.2003.08.029

M3 - Article

AN - SCOPUS:0141929455

SN - 0038-1098

VL - 128

SP - 299

EP - 302

JO - Solid State Communications

JF - Solid State Communications

IS - 8

ER -

Particle size dependence of exchange-bias and coercivity in CuO nanoparticles

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this