Superparamagnetism in Co ion-implanted epitaxial anatase TiO2 thin films

D. H. Kim; J. S. Yang; Y. S. Kim; Y. J. Chang; T. W. Noh; S. D. Bu; Y. W. Kim; Y. D. Park; S. J. Pearton; J. H. Park

doi:10.1002/andp.200310051

Superparamagnetism in Co ion-implanted epitaxial anatase TiO₂ thin films

D. H. Kim, J. S. Yang, Y. S. Kim, Y. J. Chang, T. W. Noh, S. D. Bu, Y. W. Kim, Y. D. Park, S. J. Pearton, J. H. Park

Department of Physics

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

7 Scopus citations

Abstract

We investigated the magnetic properties of Co doped anatase TiO ₂ thin films. To incorporate Co into epitaxial anatase TiO ₂ thin films, we implanted them with Co⁺ ions. The temperature dependence of the magnetization of the implanted films, taken in zero-field-cooling (ZFC) and field-cooling conditions, exhibits the main features of superparamagnetic system: the ZFC curves are rounded at the blocking temperature (T_B) and a paramagnetic-like behavior above T_B. After annealing the films, T_B increased with increasing annealing temperature. These phenomena can be explained by the formation of Co (or ferromagnetic Co compound) particles and their growth during annealing, as directly observed with transmission electron microscopy.

Original language	English
Pages (from-to)	70-71
Number of pages	2
Journal	Annalen der Physik
Volume	13
Issue number	1-2
DOIs	https://doi.org/10.1002/andp.200310051
State	Published - 2004

Keywords

Anatase TiO
Co clusters
Co ion implantation
Ferromagnetism
Superparamagnetism

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title = "Superparamagnetism in Co ion-implanted epitaxial anatase TiO2 thin films",

abstract = "We investigated the magnetic properties of Co doped anatase TiO 2 thin films. To incorporate Co into epitaxial anatase TiO 2 thin films, we implanted them with Co+ ions. The temperature dependence of the magnetization of the implanted films, taken in zero-field-cooling (ZFC) and field-cooling conditions, exhibits the main features of superparamagnetic system: the ZFC curves are rounded at the blocking temperature (TB) and a paramagnetic-like behavior above TB. After annealing the films, TB increased with increasing annealing temperature. These phenomena can be explained by the formation of Co (or ferromagnetic Co compound) particles and their growth during annealing, as directly observed with transmission electron microscopy.",

keywords = "Anatase TiO, Co clusters, Co ion implantation, Ferromagnetism, Superparamagnetism",

author = "Kim, {D. H.} and Yang, {J. S.} and Kim, {Y. S.} and Chang, {Y. J.} and Noh, {T. W.} and Bu, {S. D.} and Kim, {Y. W.} and Park, {Y. D.} and Pearton, {S. J.} and Park, {J. H.}",

year = "2004",

doi = "10.1002/andp.200310051",

language = "English",

volume = "13",

pages = "70--71",

journal = "Annalen der Physik",

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TY - JOUR

T1 - Superparamagnetism in Co ion-implanted epitaxial anatase TiO2 thin films

AU - Kim, D. H.

AU - Yang, J. S.

AU - Kim, Y. S.

AU - Chang, Y. J.

AU - Noh, T. W.

AU - Bu, S. D.

AU - Kim, Y. W.

AU - Park, Y. D.

AU - Pearton, S. J.

AU - Park, J. H.

PY - 2004

Y1 - 2004

N2 - We investigated the magnetic properties of Co doped anatase TiO 2 thin films. To incorporate Co into epitaxial anatase TiO 2 thin films, we implanted them with Co+ ions. The temperature dependence of the magnetization of the implanted films, taken in zero-field-cooling (ZFC) and field-cooling conditions, exhibits the main features of superparamagnetic system: the ZFC curves are rounded at the blocking temperature (TB) and a paramagnetic-like behavior above TB. After annealing the films, TB increased with increasing annealing temperature. These phenomena can be explained by the formation of Co (or ferromagnetic Co compound) particles and their growth during annealing, as directly observed with transmission electron microscopy.

AB - We investigated the magnetic properties of Co doped anatase TiO 2 thin films. To incorporate Co into epitaxial anatase TiO 2 thin films, we implanted them with Co+ ions. The temperature dependence of the magnetization of the implanted films, taken in zero-field-cooling (ZFC) and field-cooling conditions, exhibits the main features of superparamagnetic system: the ZFC curves are rounded at the blocking temperature (TB) and a paramagnetic-like behavior above TB. After annealing the films, TB increased with increasing annealing temperature. These phenomena can be explained by the formation of Co (or ferromagnetic Co compound) particles and their growth during annealing, as directly observed with transmission electron microscopy.

KW - Anatase TiO

KW - Co clusters

KW - Co ion implantation

KW - Ferromagnetism

KW - Superparamagnetism

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EP - 71

JO - Annalen der Physik

JF - Annalen der Physik

IS - 1-2

ER -

Superparamagnetism in Co ion-implanted epitaxial anatase TiO₂ thin films

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Keywords

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