Large vertical loop shifts in mechanically synthesized (Mn,Fe)2O3−t nanograins

Exchange bias in structure-phase separated K0.8Fe2−xNixSe2 (x=0.015) single crystal: Interface evidence

“…As we know, EB effects are always observed in the system of phase separation compounds containing a SG, FM or AFM phases, in which intrinsic phase inhomogeneity plays a key role [5][6][7][8][9][10][11]. In order to test this argument, the magnetization hysteresis loops of K 0.8 (Fe 1 À x/2 Ni x/2 ) 2 Se 2 samples with x ¼0.015 at 5 K were measured after field cooling in 20 kOe, as plotted in Fig.…”

“…Due to its large potential in technological applications, the EB phenomenon have been widely investigated [3,4]. In addition of FM/AFM heterostructure films [4] and core-shell nanoparticles [1,2,[5][6][7], the EB effects were also observed in phase separated alloys and compounds, which are composed of a variety of coexisting magnetic phases such as FM, AFM, spin-glass (SG) and so on [3,[8][9][10][11].…”

Exchange bias in single-crystalline CuO nanowires

“…Actually, strong enough magnetic fields can destroy the SG-like state entirely. 18,21 This may explain why H eb decreases for strong H cool fields. The possibility of effectively tuning the exchange bias field of the nanowires by modifying the cooling field is of special interest for applications in spintronics, where CuO nanowires are also of interest due to spin-dependent quantum transport effects.…”

“…A positive ͑upward͒ shift is usually attributed to a FM interface coupling. 18,19 Another common feature of the EB system is the training effect, which describes the decrease in H eb when the sample is successively field cycled at a fixed temperature. Systems with AFM thin layers or small grains exhibit much larger training effects, 3 which are expected to appear enhanced in nanostructured materials.…”

Local environments of Fe and Co in (Fe0.5Co0.5)75Si15B10 mechanically alloyed

“…In both cases, the nanocrystalline materials can be assumed to be constituted by an ordered phase, with crystalline coherence length in the nanometer-size range due to their grains cores, and a large contribution from the grains boundaries, which, in principle, has an atomically disordered state. The presence of this disordered phase of the grains surfaces has been proposed to be responsible for the existence of interesting magnetic properties of these materials [15].…”