Structure, Magnetic Property, Surface Morphology, and Surface Energy of Co40Fe40V10B10 Films on Si(100) Substrate

Abstract

When B and V are added to CoFe material, the mechanical strength and spin tunneling polarization of a CoFe alloy can be improved and enhanced by the high tunneling magnetoresistance (TMR) ratio. Based on these reasons, it is worthwhile investigating Co40Fe40V10B10 films. In this work, X-ray diffraction (XRD) showed that Co40Fe40V10B10 thin films have some distinct phases including CoFe (110), CoFe (200), FeB (130), and V (110) diffracted peaks with the strongest diffracted peak for 30 nm. The lowest low-frequency alternate-current magnetic susceptibility (χac) was detected at 30 nm because the large grain distribution inducing that high coercivity (Hc) enhances the spin coupling strength and low χac. The external field (Hext) had difficulty rotating in the spin state, hence, the spin sensitivity was reduced and the χac value decreased due to increased surface roughness. The 20 mm thickness had the highest χac 1.96 × 10−2 value at 50 Hz of an optimal resonance frequency (fres). The surface energy increased from 34.2 mJ/mm2 to 51.5 mJ/mm2 for Co40Fe40V10B10 films. High surface energy had corresponding strong adhesive performance. According to the magnetic and surface energy results, the optimal thickness is 20 nm due as it had the highest χac and strong adhesion.

Magnetic Colloidal Particles in Combinatorial Thin-Film Gradients for Magnetic Resonance Imaging and Hyperthermia

“…It is clearly evident that with the increase in the number of bilayers, there is a significant increase in the deposition of magnetic colloidal particles on the surface of the prepared films via a self-assembly process. The number of adsorption sites increased with the number of bilayers indicated the increase in thickness and roughness of the surface [13,43]. As a consequence, an increase in the number of deposited colloidal particles with the increase in the number of bilayers leads to the increase in surface roughness along the substrate for 5, 10, and 15 bilayers; this is in agreement with the reported literature [12,13].…”

Magnetic Properties, Adhesion, and Nanomechanical Property of Co40Fe40W20 Films on Si (100) Substrate

“…Therefore, the peak frequency of the low frequency susceptibility corresponds to the resonance frequency of the pole moment oscillation. In frequency, χ ac peak represents spin exchange coupling interaction and domain dipole moment [8,36].…”

“…The CoFeW film can be used as a seed layer or a buffer layer, and its surface energy and adhesion are very important. When the surface energy is high, the liquid absorption is large and the liquid absorption area is large, resulting in the decrease of the contact angle [8,38]. Figure 9 shows the calculated surface energy using the contact angle [23][24][25].…”

“…The CoFe layer can be a pinned layer or a free layer in the spinvalued magnetic tunneling junction (MTJ), which can be applied to the magnetoresistance random access memory (MRAM) and recording head applications [2][3][4][5][6][7]. Adding B and V elements to CoFe data has advantages in my previous work, including mechanical strength and magnetic properties [8]. At present, tungsten (W) is added to CoFe data to study its mechanical strength and magnetic properties.…”

Effect of Annealing on the Structural, Magnetic and Surface Energy of CoFeBY Films on Si (100) Substrate

“…The different thickness (t f ) of as-deposited and annealed CoFeBY films were also studied and we investigated the effects of crystallinity on the magnetic properties, adhesion and optical performance of the films. In our previous study, the properties of as-deposited Glass/CoFeBY and Si (100)/CoFeBY films were studied, as shown in Table 1 [ 23 , 24 ]. Continuing forward, we studied the as-deposited and annealed CoFeBY thin films.…”