Issue 11, 2012

Gallium substituted “114” YBaFe4O7: from a ferrimagnetic cluster glass to a cationic disordered spin glass

Abstract

The study of the ferrites YBaFe4-xGaxO7 shows that the substitution of Ga for Fe in YBaFe4O7 stabilizes the hexagonal symmetry for 0.40 ≤ x ≤ 0.70, at the expense of the cubic one. Using combined measurements of a.c. and d.c. magnetization, we establish that Ga substitution for Fe in YBaFe4O7 leads to an evolution from a geometrically frustrated spin glass (for x = 0) to a cationic disorder induced spin glass (x = 0.70). We also find an intermediate narrow range of doping where the samples are clearly phase separated having small ferrimagnetic clusters embedded in a spin glass matrix. The origin of the ferrimagnetic clusters lies in the change in symmetry of the samples from cubic to hexagonal (and a consequent lifting of the geometrical frustration) as a result of Ga doping. We also show the presence of exchange bias and domain wall pinning in these samples. The cause of both these effects can be traced back to the inherent phase separation present in the samples.

Graphical abstract: Gallium substituted “114” YBaFe4O7: from a ferrimagnetic cluster glass to a cationic disordered spin glass

Article information

Article type
Paper
Submitted
03 Nov 2011
Accepted
27 Dec 2011
First published
26 Jan 2012

J. Mater. Chem., 2012,22, 4728-4734

Gallium substituted “114” YBaFe4O7: from a ferrimagnetic cluster glass to a cationic disordered spin glass

T. Sarkar, V. Caignaert, V. Pralong and B. Raveau, J. Mater. Chem., 2012, 22, 4728 DOI: 10.1039/C2JM15647D

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