Antiparallel state, compensation point, and magnetic phase diagram ofFe3O4/M

Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles

“…1j-l) resulting in the observed decrease in M. In fact, under some conditions M(T) is negative at low temperatures becoming positive as T is increased. Namely, at a given temperature magnetization of both phases cancels out, leading to a 'compensation point' (i.e., a zero net magnetization) 19 , similar to what has been predicted theoretically for core/shell nanoparticles 13 . Interestingly, upon increasing the field the magnetization progressively exhibits an upturn at T C (Mn-oxide) (Fig.…”

“…S3a,b). These results imply that when the manganese oxide orders magnetically at T C it must couple antiferromagnetically to the iron oxide 19 (see Fig. 1j-l) resulting in the observed decrease in M. In fact, under some conditions M(T) is negative at low temperatures becoming positive as T is increased.…”

Hexagonal-Type Ising Nanowire with Core/Shell Structure Designed with Half-Integer Spins: Compensation Behaviors and Phase Diagrams in the Temperature and Interaction Planes

“…We should also mention that the N-type compensation behavior has been found for the mixed spin (1/2, 3/2) cylindrical Ising nanoparticle [22] system. Experimentally, some compensation temperature measurements in Fe 3 O 4 and Mn 3 O 4 superlattices [67] and Ni(H-COO) 2 · 2H 2 O [68] were observed. In like manner, previous studies show that at the compensation temperature, the coercivity of a material increases dramatically and at this point, only a small conductor field to invert the sign of the magnetization [64,[69][70][71][72] is required.…”

Magnetization and magnetic susceptibility of the Ising ferromagnetic/antiferromagnetic superlattice

“…Ferromagnetic(FM)/FM multilayer with FM interface exchange coupling and antiferromagnetic(AFM) interface exchange coupling such as Co/Cu/Ni [3] and Gd/ Fe [4,5], FM/AFM multilayer such as Fe/NiO [6], NiO/Co [7] and NiO/Co 84 Fe 16 [8], AFM/AFM multilayer such as FeF 2 /CoF 2 [9] and CoO/NiO [10], ferrimagnetic/ferrimagnetic superlattice such as Fe 3 O 4 /Mn 3 O 4 [11] and ferrimagnetic/AFM superlattice such as Fe 3 O 4 /CoO [12], and so on, have been studied experimentally. The interface structure, spin orientations of the constituents, the type and the strength of the interface exchange coupling, and the magnetic properties are measured, and some new phenomena have been found.…”