Study on irradiation-induced magnetic transition in FeRh alloys by means of Fe K-edge XMCD spectroscopy

In-situ XMCD evaluation of ferromagnetic state at FeRh thin film surface induced by 1 keV Ar ion beam irradiation and annealing

“…For example, ion beam irradiation induces FM state in the Fe-50 at.% Rh bulk and film samples even at low temperatures where they are originally (or intrinsically) AF states without any structural phase transition [3][4][5][6]. In accordance with our systematic investigations, we revealed that density of energy deposited through elastic collisions between ion species and samples was a crucial factor in determining ion irradiation induced magnetization of FeRh samples [7].…”

Quantitative control of magnetic ordering in FeRh thin films using 30 keV Ga ion irradiation from a focused ion beam system

“…Low-energy ion-beam irradiation induced ferromagnetic states in the FeRh thin films at low temperatures, that originally exhibited antiferromagnetism, as effectively as high-energy ion-beam irradiation. [3][4][5][6] In addition, we also showed that the change in the magnetization could be controlled by the density of the energy deposited through the elastic collisions between the ion species and the samples. The low-energy ion-beam irradiation using a focused ion beam system is a potential technique to modify the magnetic properties of materials on the nano-and micro-scales, which may lead to a variety of novel spin devices and applications.…”

“…From Fig. [5][6][7] Considering the origin of the ferromagnetic nature induced by the low-energy ion-beam irradiation, the effect of residual Ga ions in the films, namely, the gallium implantation effect, should be taken into account. The maximum value of saturation magnetization, 80 emu/g, was obtained in the sample irradiated with a fluence of 5 Â 10 13 cm À2 , which is 60% of the saturation magnetization of the ferromagnetic FeRh bulk samples (50at.%) bulk samples at room temperature.…”

Determination of threshold energies for displacements of Fe and Rh atoms in Fe-50at.%Rh intermetallic compound by using energetic electron irradiation at low temperatures

“…As well as magnetic properties, the crystalline structure changes from BCC to FCC structure depending on the temperature. Recently, we have found that energetic ion irradiation induces the changes in magnetic states and crystalline structure in Fe-50 at.%Rh bulk specimens and thin films [3][4][5] The irradiation-induced saturation magnetization is well correlated with the energy deposited through the elastic collisions between ions and target alloys [6,7]. This result implies that the change in magnetic state is attributed to lattice disordering or lattice defects produced by ion-irradiation.…”