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Oxide materials which exhibit both ferroelectricity and ferromagnetism are of great interest. Layered bismuth titanates with a Aurivillius structure, (BiFeO3)n Bi4Ti3O12, can potentially posses ferroelectric and ferromagnetic order paramaters simultaneously. It has recently been demonstrated that one such example, Bi5Fe0.5Co0.5Ti3O15 where n = 1 with half the Fe3+ sites substituted by Co3+ ions exhibits...
Ferri-ferromagnetic nanocomposites CoFe2O4-CoFe2 were prepared via reduction of the cobalt ferrite CoFe2O4 into a hydrogen atmosphere and by heat treatments. This preparation method yielded powders with relative volume fraction of CoFe2O4 and CoFe2 in the range 0-0.91. The structure and the room temperature magnetization of the samples were analyzed by X-ray diffraction, scanning electron microscope...
The formation of a parallel magnetic domain wall in the ferromagnetic (FM) Fe layer in Fe/FeF2 systems and antiferromagnetic (AF) FeF2 and MnF2 in Ni/FeF2 and Co/MnF2 bilayers as well as the magnetization reversal of uncompensated Fe interfacial moments in positively and negatively biased Ni/FeF2 was studied. Combining X-ray magnetic circular (XMCD) and linear dichroism (XMLD) measurements allows...
This papers present a novel phenomenon in FM/AF heterostructure systems (AF = FeF2, FM= (Ni,Co)), where the FM switching can be also controlled by thermal cycling. It was found that a FM saturated above the AF Neel temperature TN, spontaneously reverses its magnetization against a constant field with decreasing temperature. This reversal also exhibits a significant magnetization vs. temperature hysteresis,...
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