Canted AFM in hollow nanospheres

Canted antiferromagnetism on a nanodimensional spherical surface geometry: The case of MnCO3 small hollow nanospheres.
Jin Bae Lee, Won G. Hong, Hae Jin Kim, Z. Jaglicic, S. Jazbec, M. Wencka, A. Jelen, and J. Dolinsek

Phys. Rev. B 86, 224407 (2012)

(a) The M(H) curves of the HNSs sample and the MnCO3 bulk at T = 5 K for the magnetic field sweep ±50 kOe. The inset shows the hysteresis curves on an expanded scale around the H = 0 origin. (b) The M − χAFMH curves, by subtracting the linear (AFM-type) contribution from the measured magnetization data. Away from the hysteretic region, only the curves of the up-field run are shown. The inset shows the pure FM hysteresis loops MFM(H) on an expanded scale.