Krycka , K.L., J.A. Borchers, R.A. Booth, Y. Ijiri, K. Hasz, J.J. Rhyne and S.A. Majetich, “Origin of surface canting within F3O4nanoparticles”, Physical Review Letters, Vol. 27(1), pp. 309-318, 2014. DOI: 10.1103/PhysRevLett.113.147203
The nature of near-surface spin canting within F3O4 nanoparticles is highly debated. Here we develop a neutron scattering asymmetry analysis which quantifies the canting angle to between 23° and 42° at 1.2 T. Simultaneously, an energy-balance model is presented which reproduces the experimentally observed evolution of shell thickness and canting angle between 10 and 300 K. The model is based on the concept of Td site reorientation and indicates that surface canting involves competition between magnetocrystalline, dipolar, exchange, and Zeeman energies.
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