Superparamagnetic behavior in Fe ultrathin films on GaN(0001)

P.K.J. Wong; W. Zhang; W. Zhang; X.G. Cui; I.G. Will; Y.B. Xu; Z.K. Tao; Xueliang Li; X. Li; Z.L. Xie; R. Zhang

doi:10.1109/IVESC.2010.5644240

Superparamagnetic behavior in Fe ultrathin films on GaN(0001)

P.K.J. Wong
, W. Zhang
, W. Zhang
, X.G. Cui
, I.G. Will
, Y.B. Xu
, Z.K. Tao
, Xueliang Li
, X. Li
, Z.L. Xie
, R. Zhang

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

201 Downloads (Pure)

Abstract

In this paper, growth, structural and magnetic properties of ultrathin Fe grown on GaN(OOOl) by molecular beam epitaxy. The films and their surfaces were monitored by in-situ reflection high energy electron diffraction (RHEED) and a crystal thickness monitor. The magnetic properties of the samples were determined by a superconducting quantum interference device (SQUID) magnetometer. Superparamagnetism (SPM) of the ultrathin Fe can be activated at the ambient temperature.the hysteresis loop of an as-deposited 5 ML Fe(llO) film on GaN(0001) taken at RT and reveals that the loop on one hand has an unsaturated magnetization and on the other hand possesses tiny but noticeable Mr and Hc. These two characteristics as a whole imply a coexistence of SPM and weak FM in the ultrathin film. In order to gain further insight into this mixed magnetic state, temperature dependence of the magnetization M(T) in the form of field cooling (FC) and zero field cooling (ZFC) curves of the 5 ML sample was measured by SQUID in a T range between 5 and 300 K.

Original language	Undefined
Title of host publication	Proceedings of the 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010
Place of Publication	USA
Publisher	IEEE
Pages	494-495
Number of pages	2
ISBN (Print)	978-1-4244-6645-0
DOIs	https://doi.org/10.1109/IVESC.2010.5644240
Publication status	Published - Oct 2010
Event	8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010: Proceedings of the 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010 - Nanjing, China, Nanjing, China Duration: 14 Oct 2010 → 16 Oct 2010 Conference number: 8

Publication series

Name
Publisher	IEEE

Conference

Conference	8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010
Abbreviated title	IVESC 2010
Country/Territory	China
City	Nanjing
Period	14/10/10 → 16/10/10

Keywords

METIS-279136
EWI-19685
IR-76076

Access to Document

10.1109/IVESC.2010.5644240

Cite this

@inproceedings{645e00a3a389472c9dda668b47cd9da4,

title = "Superparamagnetic behavior in Fe ultrathin films on GaN(0001)",

abstract = "In this paper, growth, structural and magnetic properties of ultrathin Fe grown on GaN(OOOl) by molecular beam epitaxy. The films and their surfaces were monitored by in-situ reflection high energy electron diffraction (RHEED) and a crystal thickness monitor. The magnetic properties of the samples were determined by a superconducting quantum interference device (SQUID) magnetometer. Superparamagnetism (SPM) of the ultrathin Fe can be activated at the ambient temperature.the hysteresis loop of an as-deposited 5 ML Fe(llO) film on GaN(0001) taken at RT and reveals that the loop on one hand has an unsaturated magnetization and on the other hand possesses tiny but noticeable Mr and Hc. These two characteristics as a whole imply a coexistence of SPM and weak FM in the ultrathin film. In order to gain further insight into this mixed magnetic state, temperature dependence of the magnetization M(T) in the form of field cooling (FC) and zero field cooling (ZFC) curves of the 5 ML sample was measured by SQUID in a T range between 5 and 300 K.",

keywords = "METIS-279136, EWI-19685, IR-76076",

author = "P.K.J. Wong and W. Zhang and W. Zhang and X.G. Cui and I.G. Will and Y.B. Xu and Z.K. Tao and Xueliang Li and X. Li and Z.L. Xie and R. Zhang",

note = "eemcs-eprint-19685 ; 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 ; Conference date: 14-10-2010 Through 16-10-2010",

year = "2010",

month = oct,

doi = "10.1109/IVESC.2010.5644240",

language = "Undefined",

isbn = "978-1-4244-6645-0",

publisher = "IEEE",

pages = "494--495",

booktitle = "Proceedings of the 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010",

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}

Wong, PKJ, Zhang, W, Zhang, W, Cui, XG, Will, IG, Xu, YB, Tao, ZK, Li, X, Li, X, Xie, ZL & Zhang, R 2010, Superparamagnetic behavior in Fe ultrathin films on GaN(0001). in Proceedings of the 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010. IEEE, USA, pp. 494-495, 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010, Nanjing, China, 14/10/10. https://doi.org/10.1109/IVESC.2010.5644240

TY - GEN

T1 - Superparamagnetic behavior in Fe ultrathin films on GaN(0001)

AU - Wong, P.K.J.

AU - Zhang, W.

AU - Cui, X.G.

AU - Will, I.G.

AU - Xu, Y.B.

AU - Tao, Z.K.

AU - Li, Xueliang

AU - Li, X.

AU - Xie, Z.L.

AU - Zhang, R.

N1 - Conference code: 8

PY - 2010/10

Y1 - 2010/10

N2 - In this paper, growth, structural and magnetic properties of ultrathin Fe grown on GaN(OOOl) by molecular beam epitaxy. The films and their surfaces were monitored by in-situ reflection high energy electron diffraction (RHEED) and a crystal thickness monitor. The magnetic properties of the samples were determined by a superconducting quantum interference device (SQUID) magnetometer. Superparamagnetism (SPM) of the ultrathin Fe can be activated at the ambient temperature.the hysteresis loop of an as-deposited 5 ML Fe(llO) film on GaN(0001) taken at RT and reveals that the loop on one hand has an unsaturated magnetization and on the other hand possesses tiny but noticeable Mr and Hc. These two characteristics as a whole imply a coexistence of SPM and weak FM in the ultrathin film. In order to gain further insight into this mixed magnetic state, temperature dependence of the magnetization M(T) in the form of field cooling (FC) and zero field cooling (ZFC) curves of the 5 ML sample was measured by SQUID in a T range between 5 and 300 K.

AB - In this paper, growth, structural and magnetic properties of ultrathin Fe grown on GaN(OOOl) by molecular beam epitaxy. The films and their surfaces were monitored by in-situ reflection high energy electron diffraction (RHEED) and a crystal thickness monitor. The magnetic properties of the samples were determined by a superconducting quantum interference device (SQUID) magnetometer. Superparamagnetism (SPM) of the ultrathin Fe can be activated at the ambient temperature.the hysteresis loop of an as-deposited 5 ML Fe(llO) film on GaN(0001) taken at RT and reveals that the loop on one hand has an unsaturated magnetization and on the other hand possesses tiny but noticeable Mr and Hc. These two characteristics as a whole imply a coexistence of SPM and weak FM in the ultrathin film. In order to gain further insight into this mixed magnetic state, temperature dependence of the magnetization M(T) in the form of field cooling (FC) and zero field cooling (ZFC) curves of the 5 ML sample was measured by SQUID in a T range between 5 and 300 K.

KW - METIS-279136

KW - EWI-19685

KW - IR-76076

U2 - 10.1109/IVESC.2010.5644240

DO - 10.1109/IVESC.2010.5644240

M3 - Conference contribution

SN - 978-1-4244-6645-0

SP - 494

EP - 495

BT - Proceedings of the 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010

PB - IEEE

CY - USA

T2 - 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010

Y2 - 14 October 2010 through 16 October 2010

ER -