Ferromagnetic resonance studies of Fe16N2 films with a giant magnetic moment

Abstract

The g factor and 4π Ms for epitaxially grown Fe16N2(001)/In0.2Ga0.8As(001) films have been investigated by ferromagnetic resonance along with Fe films for comparison. Angular dependence of the resonance fields in the film plane of Fe16N2 films had four-fold symmetry, which was attributed to the in-plane anisotropy. The g factor for Fe16N2 films was about 2.0, which means that the magnetic moment originates mainly from spin. Thus, nothing unusual is seen about the g factor. The g factor for Fe films was about 2.1, which is very similar to the value reported previously. 4πMs values for Fe16N2 and Fe films were 2.8×104 and 2.1×104 G, respectively, which agree well with the previous data obtained by a vibrating sample magnetometer. This confirmed that Fe16N2 has a giant magnetic moment. Torque magnetometer measurements showed that Fe16N2 films have a larger perpendicular anisotropy of 7.8×106 erg/cm3, which can originate from its bct structure.

Formation and Decomposition of Metastable α′′‐Fe16N2 from in situ Powder Neutron Diffraction and Thermal Analysis

“…Great improvements in yield www.zaac.wiley-vch.de of αЈЈ-phase were achieved producing thin films with different techniques like evaporation-deposition, [11,[36][37][38][39] ion implantation, [40][41][42] molecular beam epitaxy, [43][44][45][46][47] and sputtering methods. [46,[48][49][50][51][52][53][54] The synthesis of bulk αЈЈ-Fe 16 N 2 in single phase is more difficult. [55] Various ways to generate nitrogen austenite and martensite were applied by different groups.…”

Microstructural investigation on the precipitation of α″ nitrides and α″ → γ′ nitride transformation in ion-nitrided pure iron

“…The dissolution of at different branches, ranging from crystal structure, [9,10] pre-␣ Љ results in the nucleation and development of ␥ Ј in situ cipitated behavior, [11,12,13] and technical synthesis [14,15,16] to or ex situ from the matrix. [29] However, no literature reported the measurement of mechanical [17] and magnetic [18,19,20] the direct transformation between ␣ Љ and ␥ Ј, according to properties. The precipitated behavior of ␣ Љ has been studied our knowledge.…”

Engineering perpendicular magnetic anisotropy in Fe via interstitial nitrogenation: N choose K

“…More general, understanding in detail the role of interstitial dopants such as B, C, N, O, and F could be the key in discovering novel magnetic materials. As an example, nitrogen interstitials have been suggested to be the most effective dopants at the X position to enhance uniaxial anisotropy in the compound NdFe 11 TiX due to their specific bonding to Nd atoms. 19 In the present work, we demonstrate experimentally the reorientation of the magnetization from in-plane to out-of-plane direction in α ′ -Fe 8 N x thin films as a function of c/a ratio, and present an in-depth theoretical understanding of the emerging PMA, based on the crucial role of the interstitial N atoms in determining K u .…”