Magnetic moment of α″-Fe16N2 films (invited)

Abstract

In order to determine the value of the intrinsic magnetic moment of the α ″ phase, the films of nitrogen-martensite with various N content were fabricated under various reactive sputtering conditions. The magnetic moment of (α ″+α′)-Fe16N2 films is discussed in connection with the change of the unit-cell volume of the bct structure and the degree of N site ordering in nitrogen-martensite. As a result, it is found that (1) the same structure as bulk α ″-Fe16N2 is realized in the present films, (2) the saturation magnetization σs of the α′ phase increases about 4% with increasing unit-cell volume of the α′ phase, (3) the degree of N site ordering from α′ to α ″-Fe16N2 does not much affect σs, and (4) the experimentally obtained maximum value of σs for the (α ″+α′)-Fe16N2 film was 232 emu/g. The intrinsic value of σs in the α ″ phase (in the perfectly ordered state) is proposed to be no more than 240 emu/g at 300 K.

Magnetic and structural properties of ion nitrided stainless steel

“…As for the second mechanism, all types of iron nitrides ͑Fe 16 N 2 , Fe 4 N, Fe 2-3 N͒ are ferromagnetic. [33][34][35][36][37] Thus, both factors are apparently acting in the system investigated in the present work. However, since the nitrogen concentration at the inflection point compares well with the chromium concentration, one can think of a first stage where nitrogen bonds rapidly and preferentially to Cr ͑see regime B in Fig.…”

Mechanical Milling Process of High Nitrogen Austenite

“…1,2) It can be obtained by quenching nitrogen austenite to the range below Ms temperature. This structural change always accompanies retained austenite and single phase samples of martensite can be obtained only with using thin film technique.…”

X-ray Diffraction Studies of Fe-N Bulk-Processed in a Magnetic Field Using Synchrotron Radiation

“…This far exceeds the value of 2:74 Â 10 À4 WbÁm/kg for pure Fe. 3) After their discovery, several reports described single phase [4][5][6] and single crystal thin films 7) consisting of 0 or 00 phase manufactured using various deposition techniques. However, few reports have been made of bulk single phases consisting only of 0 nor 00 , due to difficulties in the sample preparation process, as described below.…”