Cobalt chromite nanoparticles lose their spin-spiral magnetic order below about 4.4 nm and collinear ferrimagnetic order below about 3.3 nm, with the spiral period shrinking monotonically with particle size.
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Critical size limits for collinear and spin spiral magnetism in CoCr$_2$O$_4$
Cobalt chromite nanoparticles lose their spin-spiral magnetic order below about 4.4 nm and collinear ferrimagnetic order below about 3.3 nm, with the spiral period shrinking monotonically with particle size.