${\mathrm{BaV}}_{10-x}{\mathrm{Ti}}_x{\mathrm{O}}_{15}$ with $x=0.15$ exhibits coexisting orbital-ordered (OO) and orbital-disordered (OD) phases as well as slow dynamics during the phase transition from the OD phase to the OO phase. Owing to these slow dynamics and the fact that these two phases exhibit antiferromagnetic ordering with different transition temperatures, two-phase coexisting states can be considered magnetic nanoparticles in a crystal, whose size can be controlled relatively easily. Measuring the magnetic susceptibility of these states reveals that the Neel temperature of the OO phase decreases as the size of the OO phase decreases, similarly to conventional magnetic nanoparticles.

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• Magnetic phase transitions
• Magnetic nanoparticles
• Multiferroics
• Susceptibility measurements