Magnetic frustration effects in Fe-doped cobalt oxides

Structural, magnetic and magnetocaloric effect in double perovskite Ba2CrMo1−xWxO6

“…Though the maximum | S M | ≈ 1.6 J kg −1 K −1 for H = 10 kOe is about 50% of that of pure Gd metal, the S M distribution is much more uniform than that of pure Gd, which is desirable for an Ericson-cycle magnetic refrigerator [25]. This broad distribution could be ascribed to a spread of the ferromagnetic transition temperature in different ferromagnetic clusters caused by the inhomogeneity of structure and stoichiometry [26]. In comparison ith pure Gd metal [20], the ceramic samples are much cheaper; their Curie temperature can be easily adjusted by tuning the doping concentration; they are much more chemically stable than pure Gd metal.…”

Influence of A‐Site Doping on the Local Structure and Magnetic Behavior of BiFeO3 Nanoparticles Investigated by X‐Ray Absorption Fine Structure Spectroscopy

“…Generally, the ferromagnetic behavior in BFO is attributed to the appearance of double exchange interaction from the nonisoelectronic between the B-site-doped ion and Fe 3þ . [53] For the A-site doping, though the rare-earth ion La/Nd provides a spin moment, coupling between the magnetic moment of the rare-earth ion with that of Fe 3þ is very weak. [54] In contrast, the distortion of the structure or the coexistence of different phase structures is usually used to explain the emergence of ferromagnetism, [55][56][57] but BLFO and BNFO samples are of R3c structure from the XRD results.…”