Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3073751
Keywords
barium compounds; ferrimagnetic materials; ferroelectric materials; iron compounds; magnetic anisotropy; magnetic field effects; magnetic transition temperature; magnetisation; magnetoelectric effects; magnetoresistance; nanoparticles; permittivity
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Funding
- Korean Government (MOEHRD) [KRF-2005-070-C00053]
- Korean government (MEST) [M2080200019808B020019810]
- MOST/KOSEF
- National Research Foundation of Korea [R11-2000-071-13001-0, 2008-56529, 핵06A2809, 2005-070-C00053] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report a strain-induced magnetoelectric coupling in BaTiO3/Fe3O4 ferroelectric core/ferrimagnetic shell nanoparticles. The temperature-dependent magnetoresistance and magnetization clearly show several jumps near the structural phase transition temperatures of BaTiO3. Below the Verwey transition temperature of Fe3O4, i.e., at 20 K, the dielectric constant of BaTiO3/Fe3O4 decreases continuously upon application of an external magnetic field, and the observed magnetodielectric curve does not follow the square of the magnetization. We discuss the effect of strain on the electric field-dependent magnetic anisotropy near the core/shell interface.
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