Exchange Bias in Iron-Oxide Particles Nanocasted in Periodic Porous Silica

• Authors: A. Zeleňáková , J. Kováč , V. Zeleňák
• Languages of publication: EN

Abstracts

EN

Iron-oxide nanoparticles were nanocasted in the periodic mesoporous silica matrix, consisting of two-dimensional hexagonally ordered channel system with the mean diameter of the channels about 7 nm. The magnetic measurements of dc magnetization confirm behavior typical of a superparamagnetic system, such as the irreversibility of the zero-field-cooled and field-cooled curves, presence of a maximum in zero-field-cooled curve related with blocking temperature T_C and revealing of coercivity H_C below T_C. The existence of negative exchange bias effect below T_C was confirmed in our system represented by value of exchange bias field H_{EB}=-970 Oe measured at the temperature 2 K.

Keywords

EN

61.46.Df; 68.37.Lp; 75.20.-g; 75.30.Cr

Discipline

• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 68.37.Lp: Transmission electron microscopy (TEM)
• 75.20.-g: Diamagnetism, paramagnetism, and superparamagnetism
• 61.46.Df: Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 1
• Pages: 357-359

Dates

published

2009-01

Contributors

author

A. Zeleňáková

• Department of Solid State Physics, University of P.J. Šafárik, Park Angelinum 9, 041 54 Košice, Slovakia

author

J. Kováč

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia

author

V. Zeleňák

• Department of Inorganic Chemistry, University of P.J. Šafárik, Moyzesova 51, 041 54 Košice, Slovakia

References

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Identifiers

DOI

10.12693/APhysPolA.115.357