85 citations · 370 across the 12 of their papers we have counts for
12 papers
High Resolution Hard X-ray Magnetic Imaging with Dichroic Ptychography
Claire Donnelly, Valerio Scagnoli, Manuel Guizar-Sicairos +8
Imaging the magnetic structure of a material is essential to understanding the influence of the physical and chemical microstructure on its magnetic properties. Magnetic imaging te…
Microscopic mechanism of the giant magnetocaloric effect in MnCoGe alloys probed by XMCD
F. Guillou, F. Wilhelm, O. Tegus +1
One important aspect of the magneto-structural transition in MnCoGe and related materials is the reduction in saturation magnetization from the orthorhombic to the hexagonal phase.…
First-order ferromagnetic transition in single-crystalline (Mn,Fe)2(P,Si)
H. Yibole, F. Guillou, Y. K. Huang +4
(Mn,Fe)2(P,Si) single crystals have been successfully grown by flux method. Single crystal diffraction demonstrates that Mn0.83Fe1.17P0.72Si0.28 crystallizes in a hexagonal crystal…
Moment evolution across the ferromagnetic phase transition of giant magnetocaloric (Mn,Fe)2(P,Si,B) compounds
H. Yibole, F. Guillou, L. Caron +6
A strong electronic reconstruction resulting in a quenching of the Fe magnetic moments has recently been predicted to be at the origin of the giant magnetocaloric effect displayed…
Tuning the metamagnetic transition in the (Co,Fe)MnP system for magnetocaloric purposes
F. Guillou, E. Brueck
The inverse magnetocaloric effect taking place at the antiferro-to-ferromagnetic transition of (Co,Fe)MnP phosphides has been characterized by magnetic and direct ΔTad measurements…
Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3
F. Guillou, Y. Bréard, V. Hardy
(Pr0.7Sm0.3)0.7Ca0.3CoO3 belongs to a class of cobalt oxides undergoing a first-order transition (T* close to 90 K) associated to a coupled change in the valence and spin-state deg…
Jumps in entropy and magnetic susceptibility at the valence and spin-state transition in a cobalt oxide
V. Hardy, F. Guillou, Y. Bréard
A wide family of cobalt oxides of formulation (Pr,Ln,Ca)CoO3 (Ln being a lanthanide) exhibits a coupled valence and spin-state transition (VSST) at a temperature T*, which involves…
Coupled valence and spin state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3
F. Guillou, Q. Zhang, Z. Hu +7
The coupled valence and spin state transition (VSST) taking place in (Pr0.7Sm0.3)0.7Ca0.3CoO3 was investigated by soft x-ray absorption spectroscopy (XAS) experiments carried out a…
Ordering process and ferroelectricity in a spinel derived from FeV2O4
Q. Zhang, K. Singh, F. Guillou +4
The spinel FeV2O4 is known to exhibit peculiar physical properties, which is generally ascribed to the unusual presence of two cations showing a pronounced interplay between spin,…
On the derivation of the magnetocaloric properties in ferrimagnetic spinel Mn3O4
S. Thota, F. Guillou, V. Hardy +3
Large magnetocaloric effect has been observed in Mn3O4 around its ferrimagnetic transition at TN = 42.75 K. Field-induced isothermal entropy changes (\DeltaS) were derived from bot…
Magnetocaloric effect and improved relative cooling power in (La0.7Sr0.3MnO3/SrRuO3) superlattices
Q. Zhang, S. Thota, F. Guillou +4
Magnetic properties of a series of (La0.7Sr0.3MnO3/SrRuO3) superlattices, where the SrRuO3 layer thickness is varying, are examined. A room-temperature magnetocaloric effect is obt…
Anisotropic magnetocaloric effect in all-ferromagnetic (La0.7Sr0.3MnO3/SrRuO3) superlattices
S. Thota, Q. Zhang, F. Guillou +5
We exploit the magnetic interlayer coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices to realize a crossover between inverse and conventional magnetic entropy changes. Our data reveal…