Oxygen vacancy-dependent microstructural, optical and magnetic properties of sol-gel Tb0.2 Er1 Y2.8 Fe5 O12 films

Suleiman M. Elhamali, N. B. Ibrahim, S. Radiman

Research output: Contribution to journalArticle

Abstract

A garnet, composition of Tb0.2 Er1 Y1.8 Fe5 O12, based nanostructure thin films were prepared by a sol-gel method for a magneto-optical isolator. The films were deposited on a quartz substrate and crystallised at 900 °C under different annealing environments (air, oxygen and argon). Fe2+ concentration-dependent, microstructural, optical and magnetic properties were investigated systematically. This study shows that Fe2+ ions are dominant in the air-annealed film with an atomic percentage of 77.63%, which results in the expansion of the unit cell. In addition, an excess of Fe2+ ions results in much higher optical absorption, remanent magnetisation and saturation magnetisation, caused by the migration of oxygen vacancies due to the reduction of Fe3+ to Fe2+. Conversely, annealing in oxygen and argon gases suppresses the formation of oxygen vacancies, hence improves the optical and magnetic properties of the films. Low saturation magnetisation, combined with low optical absorption, is highly desirable in magneto-optical applications.

Original languageEnglish
Article number166048
JournalJournal of Magnetism and Magnetic Materials
DOIs
Publication statusAccepted/In press - 1 Jan 2019

Fingerprint

Oxygen vacancies
Sol-gels
Magnetic properties
Optical properties
Argon
gels
Saturation magnetization
magnetic properties
optical properties
Light absorption
oxygen
Annealing
Ions
magnetization
Oxygen
Quartz
optical absorption
argon
Garnets
Air

Keywords

  • Magnetic materials
  • Sol-gel preparation
  • Surface morphology

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Oxygen vacancy-dependent microstructural, optical and magnetic properties of sol-gel Tb0.2 Er1 Y2.8 Fe5 O12 films",
abstract = "A garnet, composition of Tb0.2 Er1 Y1.8 Fe5 O12, based nanostructure thin films were prepared by a sol-gel method for a magneto-optical isolator. The films were deposited on a quartz substrate and crystallised at 900 °C under different annealing environments (air, oxygen and argon). Fe2+ concentration-dependent, microstructural, optical and magnetic properties were investigated systematically. This study shows that Fe2+ ions are dominant in the air-annealed film with an atomic percentage of 77.63{\%}, which results in the expansion of the unit cell. In addition, an excess of Fe2+ ions results in much higher optical absorption, remanent magnetisation and saturation magnetisation, caused by the migration of oxygen vacancies due to the reduction of Fe3+ to Fe2+. Conversely, annealing in oxygen and argon gases suppresses the formation of oxygen vacancies, hence improves the optical and magnetic properties of the films. Low saturation magnetisation, combined with low optical absorption, is highly desirable in magneto-optical applications.",
keywords = "Magnetic materials, Sol-gel preparation, Surface morphology",
author = "Elhamali, {Suleiman M.} and Ibrahim, {N. B.} and S. Radiman",
year = "2019",
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issn = "0304-8853",
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AU - Elhamali, Suleiman M.

AU - Ibrahim, N. B.

AU - Radiman, S.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - A garnet, composition of Tb0.2 Er1 Y1.8 Fe5 O12, based nanostructure thin films were prepared by a sol-gel method for a magneto-optical isolator. The films were deposited on a quartz substrate and crystallised at 900 °C under different annealing environments (air, oxygen and argon). Fe2+ concentration-dependent, microstructural, optical and magnetic properties were investigated systematically. This study shows that Fe2+ ions are dominant in the air-annealed film with an atomic percentage of 77.63%, which results in the expansion of the unit cell. In addition, an excess of Fe2+ ions results in much higher optical absorption, remanent magnetisation and saturation magnetisation, caused by the migration of oxygen vacancies due to the reduction of Fe3+ to Fe2+. Conversely, annealing in oxygen and argon gases suppresses the formation of oxygen vacancies, hence improves the optical and magnetic properties of the films. Low saturation magnetisation, combined with low optical absorption, is highly desirable in magneto-optical applications.

AB - A garnet, composition of Tb0.2 Er1 Y1.8 Fe5 O12, based nanostructure thin films were prepared by a sol-gel method for a magneto-optical isolator. The films were deposited on a quartz substrate and crystallised at 900 °C under different annealing environments (air, oxygen and argon). Fe2+ concentration-dependent, microstructural, optical and magnetic properties were investigated systematically. This study shows that Fe2+ ions are dominant in the air-annealed film with an atomic percentage of 77.63%, which results in the expansion of the unit cell. In addition, an excess of Fe2+ ions results in much higher optical absorption, remanent magnetisation and saturation magnetisation, caused by the migration of oxygen vacancies due to the reduction of Fe3+ to Fe2+. Conversely, annealing in oxygen and argon gases suppresses the formation of oxygen vacancies, hence improves the optical and magnetic properties of the films. Low saturation magnetisation, combined with low optical absorption, is highly desirable in magneto-optical applications.

KW - Magnetic materials

KW - Sol-gel preparation

KW - Surface morphology

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