Magnetic properties and structural implications for nanocrystallineFe−Ti−Nthin films

Abstract

The magnetization ( M ) as a function of temperature ( T ) from 2 to 300 K and in-plane field ( H ) up to 1 kOe, room temperature easy and hard direction in-plane field hysteresis loops for fields between 100 ± Oe, and 10 GHz ferromagnetic resonance (FMR) profiles have been measured for a series of soft-magnetic nano-crystalline 50 nm thick Fe-Ti-N films made by magnetron sputtering in an in-plane field. The nominal titanium concentration was 3 at. % and the nitrogen concentrations ( N x ) ranged from zero to 12.7 at. %. The saturation magnetization ( s M ) vs. T data and the extracted exchange parameters as a function of N x are consistent with a lattice expansion due to the addition of interstitial nitrogen in the body-centered-cubic (bcc) lattice and a structural transition to body-centered-tetragonal (bct) in the 6 8 − at. % nitrogen range.

Effect of dopants on thermal stability and self-diffusion in iron-nitride thin films

“…When added in a relatively small amount ( 11 at. % N), N atoms get dissolved interstitially into the host metal lattice [9,10]. Due to dominant Fe-Fe interactions, N atoms are weakly bonded to Fe atoms and preserve the structure and the magnetic properties of Fe [11].…”

“…In attempts to make interstitial Fe-N more stable, addition or doping of impurity element(s) was proposed in such a way * mgupta@csr.res.in/dr.mukul.gupta@gmail.com that the amount of impurity must be low enough to affect the structural or the magnetic properties adversely [9,[21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Such impurity doped systems were termed as Fe-X-N with X = few at.…”

Structural, electrical and magnetic properties of Fe–Co–Cr and Fe–Co–Cr–N nanocrystalline alloy films

“…However, the origin of the expansion is different from that of Fe-Co-Cr thin films. The former is ascribed to N atoms residing in the inter- stitial sites of the lattice, while the latter to Cr atoms replacement [21].…”

Dependence of soft-magnetic properties on film thickness and high frequency characteristics for Fe–Co–Cr–N alloy films

“…FeCo-based soft-magnetic thin film materials have attracted much attention [1][2][3][4][5][6][7][8] and are extensively incorporated in many high frequency applications, such as soft-magnetic underlayers in recording media, micro-magnetic devices and magnetic sensors, by light of high saturation magnetization, low coercivity, high permeability, high electrical resistivity and reconcilable anisotropy field. However, excellent soft-magnetic properties, large magnetization, and high electrical resistivity are generally not simultaneously achieved since soft-magnetic films with high electrical resistivity are generally prepared in an oxygen atmosphere, which leads to the oxidization of Fe, Co, FeCo or the decrease of magnetic phase volume and therefore lower magnetization [9,10].…”