Persistent Photoinduced Magnetism in Heterostructures of Prussian Blue Analogues

Abstract

Heterostructured ABA thin films consisting of two different Prussian blue analogues, where A is a ferromagnet and B is a photoinducible ferrimagnet, have been fabricated for the first time. This novel arrangement allows the magnetization to be decreased by irradiation with white light and significantly increases the ordering temperature of the photoinduced magnetism from 18 to 75 K.

High-pressure neutron scattering of the magnetoelastic Ni-Cr Prussian blue analog

“…Charge compensation used the neutralizing electron gun, aromatic C-1s levels were defined to be 284.7 eV, and the analyzer was 20 eV with a step size of 0.05 eV. We used the relative sensitivity factors (RSFs) from Kratos for Cl and N, and derived our own for Ni using NiCl 2 and for K and Cr from K 3 Cr(CN) 6 . The XRD was at room temperature (296 K) on a Rigaku Ultima III using a 1.6 kW Cu anode (λ = 1.54Å).…”

“…For DFT crystal calculations, "idealized" KNi[Cr(CN) 6 ] and "isomerized" KNi[Cr(NC) 6 ] are used because the defect lattice has structural glassiness that is problematic for DFT structural optimization. To determine the required additional electron repulsion for the d-electrons (parameterized as Racah's "A" or Hubbard's "U" parameters), 1931 we use one parameter for both Ni and Cr and optimize the fractional coordinates while varying the lattice parameter of KNi[Cr(CN) 6 ].…”

“…To determine the required additional electron repulsion for the d-electrons (parameterized as Racah's "A" or Hubbard's "U" parameters), 1931 we use one parameter for both Ni and Cr and optimize the fractional coordinates while varying the lattice parameter of KNi[Cr(CN) 6 ]. This approach yields a nearly linear dependence of a = 10.205Å +(0.0315 × U )Å/eV, so we choose U = 7 eV.…”

“…4 A resurgent interest in NiCrPB and its pressure dependent magnetism was sparked in 2010 when a new type of photomagnetic effect was observed in heterostructures of cobalt hexacyanoferrate (CoFePB) and NiCrPB. 6 This year, subsequent reports definitively showed the hypothesized strain coupling between the photostrictive CoFePB and the neighboring layer of the magnetoelastic NiCrPB.…”

Metal Substitution Effect on a Three-Dimensional Cyanido-Bridged Fe Spin-Crossover Network

“…In the field of molecule-based magnets [26][27][28][29][30], cyanido-bridged metal assemblies have drawn attention because they exhibit various magnetic functionalities such as a high Curie temperature (T c ) [31][32][33][34], a charge transfer transition [35][36][37][38][39][40][41][42], and an externally stimulated phase transition phenomena [43][44][45][46][47]. In the recent years, we have synthesized several kinds of magnetic cyanido-bridged bimetal assemblies possessing Fe spin-crossover sites.…”