Spin-glass-like freezing of inner and outer surface layers in hollow γFe${}_2$O${}_3$ nanoparticles

Hafsa Khurshid, Paula Lampen-Kelley, Òscar Iglesias +5

Disorder among surface spins largely dominates the magnetic response of ultrafine magnetic particle systems. In this work, we examine time-dependent magnetization in high-quality,…