Thermomagnetic determination of Fe3O4 magnetic nanoparticle diameters for biomedical applications

► Size distribution of nanoparticles determined via thermomagnetic response. ► Calculated distribution exhibited reasonable agreement with electron microscopy. ► Effective anisotropy constant determined is by scaling of distribution function. ► Minimizes need for particle sizing using electron microscopy. ► Facile alternative to conventional size determination techniques.