Surface modifications and tailoring magnetism in Ni48·4Mn28.8Ga22.8 films by 120 keV proton irradiation

Influence of proton irradiation on the magnetic properties of two-dimensional Ni(II) molecular magnet

“…Similar non-monotonic effects of proton irradiation are commonly found in the literature 31 , 33 , 34 , 44 – 46 . In the Ni 48·4 Mn 28.8 Ga 22.8 film irradiated with 120 keV protons 45 , the M S for ϕ = 10 15 cm −2 raised to 155% of the non-irradiated sample’s value, but for ϕ = 2 × 10 16 cm −2 , the observed M S was only 102%. Another case is the initially diamagnetic SiC (0001) single crystal 44 that displays ferromagnetism after 3 MeV proton irradiation treatment.…”

“…This paramagnetic contribution may also cause the appearance of the observed step in the hysteresis loop near-zero field. The other possibility is the chemical composition modification of Ni(MPD) 2 SO 4 samples by incorporating the highly energetic hydrogen atoms into the crystal lattice 44 , 45 . However, no additional phases were detected in the XRPD and IR measurements.…”

Microstructure Evolution and Nanotribological Properties of Different Heat-Treated AISI 420 Stainless Steels after Proton Irradiation

“…The proton irradiation was performed by using a proton accelerator attached to the ground-based complex irradiation simulation system at the Harbin Institute of Technology (Harbin, China). During the irradiation process, the specimens were placed in a vacuum of 10 −3 –10 −4 Pa, and maintained at room temperature [27]. Before the proton irradiation test, the AISI 420 steel after annealing and quenching and tempering was processed into the pellet sample shown in Figure 1, and after surface polishing treatment, the pellets were inserted into an irradiation specimen holder, as shown in Figure 2.…”

Defect Engineering: Electron-Exchange Integral Manipulation to Generate a Large Magnetocaloric Effect in Ni41Mn43Co6Sn10 Alloys

“…For Ni–(Co)–Mn–X (X = Sn, In, Sb)-based alloys, Δ S M is mainly determined by the magnetization of ferromagnetic austenite, which can be effectively modified by defect engineering. In our previous work, the magnetofunctional behaviors of NiMnGa films were manipulated by employing proton irradiation to induce Frenkel defects that change the Mn–Mn atomic space. , Typically, the saturation magnetization of NiMnGa films increased from 60 to 98 A m 2 /kg. However, the penetration depth of proton irradiation is too small (<8 μm for protons with an energy of 1 MeV) and can only be applied to extremely thin materials.…”