Paramagnetic defects and exchange coupled spins in pristine ultrananocrystalline diamonds

V. Yu Osipov; A. I. Shames; T. Enoki; K. Takai; M. V. Baidakova; A. Ya Vul'

doi:10.1016/j.diamond.2007.06.003

Paramagnetic defects and exchange coupled spins in pristine ultrananocrystalline diamonds

V. Yu Osipov, A. I. Shames, T. Enoki, K. Takai, M. V. Baidakova, A. Ya Vul'

Department of Physics

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

60 Scopus citations

Abstract

Electron paramagnetic resonance (EPR) and magnetic susceptibility measurements were done on nanodiamond samples fabricated by the detonation method and purified by acids. Comprehensive acid treatment leads to the reduction of EPR signals of magnetic impurities and revealing two weak and narrow EPR lines with g₁ = 4.26, {up triangle, open}H_pp = 2.9 mT and g₂ = 4.00, {up triangle, open}H_pp = 1.4 mT at T = 4 K, separated by the distance of 10.4 mT. The origin of this new doublet EPR signal observed in the well purified sample is discussed. The magnetic susceptibility behavior and doublet EPR signal (g ∼ 4) suggest the weak antiferromagnetically exchange coupling of S = 1/2 paramagnetic defects as well as the presence of isolated dimers with S = 1.

Original language	English
Pages (from-to)	2035-2038
Number of pages	4
Journal	Diamond and Related Materials
Volume	16
Issue number	12
DOIs	https://doi.org/10.1016/j.diamond.2007.06.003
State	Published - 1 Dec 2007

Keywords

Electron paramagnetic resonance
Magnetic properties
SQUID
Ultrananocrystalline diamonds

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Chemistry (all)
Mechanical Engineering
Materials Chemistry
Electrical and Electronic Engineering

Access to Document

10.1016/j.diamond.2007.06.003

Cite this

@article{7e60939eb1f84866a0d31f92bf448bed,

title = "Paramagnetic defects and exchange coupled spins in pristine ultrananocrystalline diamonds",

abstract = "Electron paramagnetic resonance (EPR) and magnetic susceptibility measurements were done on nanodiamond samples fabricated by the detonation method and purified by acids. Comprehensive acid treatment leads to the reduction of EPR signals of magnetic impurities and revealing two weak and narrow EPR lines with g1 = 4.26, {up triangle, open}Hpp = 2.9 mT and g2 = 4.00, {up triangle, open}Hpp = 1.4 mT at T = 4 K, separated by the distance of 10.4 mT. The origin of this new doublet EPR signal observed in the well purified sample is discussed. The magnetic susceptibility behavior and doublet EPR signal (g ∼ 4) suggest the weak antiferromagnetically exchange coupling of S = 1/2 paramagnetic defects as well as the presence of isolated dimers with S = 1.",

keywords = "Electron paramagnetic resonance, Magnetic properties, SQUID, Ultrananocrystalline diamonds",

author = "Osipov, {V. Yu} and Shames, {A. I.} and T. Enoki and K. Takai and Baidakova, {M. V.} and Vul', {A. Ya}",

note = "Funding Information: V.Yu.O. and M.V.B. thank the Japanese Society for the Promotion of Science (JSPS) and the Interactive Research Center of Science of Tokyo Institute of Technology for the fellowship and financial support in FY 2002, 2004–2005. Authors also thank the New Energy Development Organization of Japan (NEDO, grant # 04IT4) for the financial support. V.Yu.O. also thanks Dr. Yousuke Kobayashi for the useful preliminary information with respect to some details of chemical purification and Dr. Akira Miyazaki for his expert advices with respect to the chemical equipment.",

year = "2007",

month = dec,

day = "1",

doi = "10.1016/j.diamond.2007.06.003",

language = "English",

volume = "16",

pages = "2035--2038",

journal = "Diamond and Related Materials",

issn = "0925-9635",

publisher = "Elsevier BV",

number = "12",

}

TY - JOUR

T1 - Paramagnetic defects and exchange coupled spins in pristine ultrananocrystalline diamonds

AU - Osipov, V. Yu

AU - Shames, A. I.

AU - Enoki, T.

AU - Takai, K.

AU - Baidakova, M. V.

AU - Vul', A. Ya

N1 - Funding Information: V.Yu.O. and M.V.B. thank the Japanese Society for the Promotion of Science (JSPS) and the Interactive Research Center of Science of Tokyo Institute of Technology for the fellowship and financial support in FY 2002, 2004–2005. Authors also thank the New Energy Development Organization of Japan (NEDO, grant # 04IT4) for the financial support. V.Yu.O. also thanks Dr. Yousuke Kobayashi for the useful preliminary information with respect to some details of chemical purification and Dr. Akira Miyazaki for his expert advices with respect to the chemical equipment.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - Electron paramagnetic resonance (EPR) and magnetic susceptibility measurements were done on nanodiamond samples fabricated by the detonation method and purified by acids. Comprehensive acid treatment leads to the reduction of EPR signals of magnetic impurities and revealing two weak and narrow EPR lines with g1 = 4.26, {up triangle, open}Hpp = 2.9 mT and g2 = 4.00, {up triangle, open}Hpp = 1.4 mT at T = 4 K, separated by the distance of 10.4 mT. The origin of this new doublet EPR signal observed in the well purified sample is discussed. The magnetic susceptibility behavior and doublet EPR signal (g ∼ 4) suggest the weak antiferromagnetically exchange coupling of S = 1/2 paramagnetic defects as well as the presence of isolated dimers with S = 1.

AB - Electron paramagnetic resonance (EPR) and magnetic susceptibility measurements were done on nanodiamond samples fabricated by the detonation method and purified by acids. Comprehensive acid treatment leads to the reduction of EPR signals of magnetic impurities and revealing two weak and narrow EPR lines with g1 = 4.26, {up triangle, open}Hpp = 2.9 mT and g2 = 4.00, {up triangle, open}Hpp = 1.4 mT at T = 4 K, separated by the distance of 10.4 mT. The origin of this new doublet EPR signal observed in the well purified sample is discussed. The magnetic susceptibility behavior and doublet EPR signal (g ∼ 4) suggest the weak antiferromagnetically exchange coupling of S = 1/2 paramagnetic defects as well as the presence of isolated dimers with S = 1.

KW - Electron paramagnetic resonance

KW - Magnetic properties

KW - SQUID

KW - Ultrananocrystalline diamonds

UR - http://www.scopus.com/inward/record.url?scp=36148980383&partnerID=8YFLogxK

U2 - 10.1016/j.diamond.2007.06.003

DO - 10.1016/j.diamond.2007.06.003

M3 - Article

AN - SCOPUS:36148980383

SN - 0925-9635

VL - 16

SP - 2035

EP - 2038

JO - Diamond and Related Materials

JF - Diamond and Related Materials

IS - 12

ER -

Paramagnetic defects and exchange coupled spins in pristine ultrananocrystalline diamonds

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this