Spin canting across core/shell Fe₃O₄/Mn_xFe_3-xO₄ nanoparticles.

ABSTRACT: Magnetic nanoparticles (MNPs) have become increasingly important in biomedical applications like magnetic imaging and hyperthermia based cancer treatment. Understanding their magnetic spin configurations is important for optimizing these applications. The measured magnetization of MNPs can be significantly lower than bulk counterparts, often due to canted spins. This has previously been presumed to be a surface effect, where reduced exchange allows spins closest to the nanoparticle surface to deviate locally from collinear structures. We demonstrate that intraparticle effects can induce spin canting throughout a MNP via the Dzyaloshinskii-Moriya interaction (DMI). We study ~7.4 nm diameter, core/shell Fe₃O₄/Mn_xFe_3-xO₄ MNPs with a 0.5 n

SUBMITTER: Oberdick SD 

PROVIDER: S-EPMC5821856 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature