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Creators/Authors contains: "Smith, Lyndon"

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  1. ; ; ; (, Physica Scripta)
    Abstract Surface segregation is a ubiquitous phenomenon driven by minimization of the total free energy. In this paper we study surface segregation in multicomponent magnetic Bismuth ferrite nanoparticles alloyed with varying amounts of Dysprosium, Zinc and Titanium. We employ surface and bulk sensitive spectroscopic probes to unravel a significant surface segregation of Bismuth oxide and Titanium oxide. High coercive fields of BiFe0.95Ti0.05O3(BFTO) and BiFe0.96(Zn, Ti)0.02O3(BFZTO) at room temperature reveal that they have a strong exchange bias. This suggests that the Titanium oxide is magnetically active, and there is a Ti induceddoferromagnetism in action between these nanoparticles. We show, with the addition of Dy2O3, the Ti induceddoferromagnetism is suppressed making (BDFZTO) superparamagnetic. We observe that all three differently alloyed Bismuth ferrite nanoparticles show a non-saturating paramagnetic background. 
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    Free, publicly-accessible full text available July 1, 2026