MBE-grown Fe magnetic quantum dots in ZnS matrix

S. K. Lok; B. You; Bei Zhang; X. X. Zhang; I. K. Sou; G. K.L. Wong

doi:10.1109/TMAG.2007.893859

MBE-grown Fe magnetic quantum dots in ZnS matrix

S. K. Lok^*, B. You, Bei Zhang, X. X. Zhang, I. K. Sou, G. K.L. Wong

^*Corresponding author for this work

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

11 Scopus citations

Abstract

A multilayer magnetic quantum dot sample containing 5 layers of Fe quantum dots (QDs) embedded in six layers of ZnS spacer was grown by molecular beam epitaxy (MBE). High-resolution transmission electron microscopy (HRTEM) observations reveal that the Fe QDs are single crystalline with spherical shape of diameters around 3 to 4 nm and area density of 1.5 × 10¹² cm^-3. Its zero-field cooled (ZFC) and field cooled (FC) curves measured at low field (100 Oe) show the magnetic relaxation effect with a blocking temperature around 26 K. The hysteresis loop measured at 5 K shows a coercivity of 83 Oe, confirming the slow relaxation process and coercivity enhancement attributed to the nanoparticle nature of the sample.

Original language	English (US)
Pages (from-to)	3127-3129
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	43
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2007.893859
State	Published - Jun 2007
Externally published	Yes

Keywords

Magnetic anisotropy
Quantum dots

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2007.893859

Cite this

@article{be8e509eef924a5fbb59cea18799f92a,

title = "MBE-grown Fe magnetic quantum dots in ZnS matrix",

abstract = "A multilayer magnetic quantum dot sample containing 5 layers of Fe quantum dots (QDs) embedded in six layers of ZnS spacer was grown by molecular beam epitaxy (MBE). High-resolution transmission electron microscopy (HRTEM) observations reveal that the Fe QDs are single crystalline with spherical shape of diameters around 3 to 4 nm and area density of 1.5 × 1012 cm-3. Its zero-field cooled (ZFC) and field cooled (FC) curves measured at low field (100 Oe) show the magnetic relaxation effect with a blocking temperature around 26 K. The hysteresis loop measured at 5 K shows a coercivity of 83 Oe, confirming the slow relaxation process and coercivity enhancement attributed to the nanoparticle nature of the sample.",

keywords = "Magnetic anisotropy, Quantum dots",

author = "Lok, {S. K.} and B. You and Bei Zhang and Zhang, {X. X.} and Sou, {I. K.} and Wong, {G. K.L.}",

year = "2007",

month = jun,

doi = "10.1109/TMAG.2007.893859",

language = "English (US)",

volume = "43",

pages = "3127--3129",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "6",

}

TY - JOUR

T1 - MBE-grown Fe magnetic quantum dots in ZnS matrix

AU - Lok, S. K.

AU - You, B.

AU - Zhang, Bei

AU - Zhang, X. X.

AU - Sou, I. K.

AU - Wong, G. K.L.

PY - 2007/6

Y1 - 2007/6

N2 - A multilayer magnetic quantum dot sample containing 5 layers of Fe quantum dots (QDs) embedded in six layers of ZnS spacer was grown by molecular beam epitaxy (MBE). High-resolution transmission electron microscopy (HRTEM) observations reveal that the Fe QDs are single crystalline with spherical shape of diameters around 3 to 4 nm and area density of 1.5 × 1012 cm-3. Its zero-field cooled (ZFC) and field cooled (FC) curves measured at low field (100 Oe) show the magnetic relaxation effect with a blocking temperature around 26 K. The hysteresis loop measured at 5 K shows a coercivity of 83 Oe, confirming the slow relaxation process and coercivity enhancement attributed to the nanoparticle nature of the sample.

AB - A multilayer magnetic quantum dot sample containing 5 layers of Fe quantum dots (QDs) embedded in six layers of ZnS spacer was grown by molecular beam epitaxy (MBE). High-resolution transmission electron microscopy (HRTEM) observations reveal that the Fe QDs are single crystalline with spherical shape of diameters around 3 to 4 nm and area density of 1.5 × 1012 cm-3. Its zero-field cooled (ZFC) and field cooled (FC) curves measured at low field (100 Oe) show the magnetic relaxation effect with a blocking temperature around 26 K. The hysteresis loop measured at 5 K shows a coercivity of 83 Oe, confirming the slow relaxation process and coercivity enhancement attributed to the nanoparticle nature of the sample.

KW - Magnetic anisotropy

KW - Quantum dots

UR - http://www.scopus.com/inward/record.url?scp=34249093085&partnerID=8YFLogxK

U2 - 10.1109/TMAG.2007.893859

DO - 10.1109/TMAG.2007.893859

M3 - Article

AN - SCOPUS:34249093085

SN - 0018-9464

VL - 43

SP - 3127

EP - 3129

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 6

ER -

MBE-grown Fe magnetic quantum dots in ZnS matrix

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this