Size-Dependent Magnetic Properties of Single-Crystalline Multiferroic BiFeO3 Nanoparticles

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• 作者：Tae-Jin Park ; Georgia C. Papaefthymiou ; Arthur J. Viescas ; Arnold R. Moodenbaugh ; Stanislaus S. Wong
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：March 2007
• 年：2007
• 卷：7
• 期：3
• 页码：766 - 772
• 全文大小：384K
• 年卷期：v.7,no.3(March 2007)
• ISSN：1530-6992

文摘

As-prepared, single-crystalline bismuth ferrite nanoparticles show strong size-dependent magnetic properties that correlate with: (a) increasedsuppression of the known spiral spin structure (period length of ~62 nm) with decreasing nanoparticle size and (b) uncompensated spins andstrain anisotropies at the surface. Zero-field-cooled and field-cooled magnetization curves exhibit spin-glass freezing behavior due to a complexinterplay between finite size effects, interparticle interactions, and a random distribution of anisotropy axes in our nanoparticle assemblies.