In situ fabrication of Co90Nb10 soft magnetic thin films with adjustable resonance frequency from 1.3to4.9GHz

Abstract

In this work, we realized in situ fabricated Co90Nb10 soft magnetic thin films, with variable in-plane uniaxial magnetic anisotropy, without using the field induced method or postfabrication treatment. In situ control over the in-plane uniaxial magnetic anisotropy field, which varied from 1.6to22.7kAm−1, was achieved by adjusting the deposition oblique angle from 0° to 38°. As a consequence, the resonance frequencies of the films were continuously increased from 1.3to4.9GHz.

Good High-Frequency and Soft Magnetic Properties of (Ni75Fe25) x (ZnO)1−x Nano-Granular Films with Wide Metal Volume Fraction (x) Range

“…Figure 4 shows the dependence of complex permeability on frequency f for the films with various x from high value to low value. The demand of good high-frequency properties is that with the increase of the frequency f , the μ value is high and keeps almost invariable until μ decreases greatly; however the μ value is low and keeps invariable or slow increase until the appearance of the ferromagnetic resonance peak [6,7,9,10]. Based on this criterion, we can evaluate the measurement results of the complex permeability μ = μ − jμ on the frequency f .…”

“…Comparing with the MIGF systems and metal soft magnetic films [4][5][6][7][8][9][10][11], little definite work has been focused on the soft magnetic properties and the high-frequency characteristics of another systems which are fabricated by the semiconductor materials and ferromagnetic metal. Considering the moderate resistivity and special transport properties of semiconductors such as ZnO, SnO 2 , and HfO 2 , metal-semiconductor granular films (MSCGF) consisting of magnetic metal nano-granules uniformly distributed in a semiconductor matrix may also possess good soft magnetic properties and high-frequency properties.…”

Ultra-high ferromagnetic resonance frequency in exchange-biased system

“…One of the most important issues for these studies is how to tune the ferromagnetic resonance (FMR) frequency to meet the demand for specific high-frequency applications. In many modern devices, the operating frequencies have reached gigahertz bands [4][5][6][7]. The FMR frequency of magnetic thin films used in such devices should be very high, ideally beyond 5 GHz or even 10 GHz.…”

“…Soft magnetic thin films aimed for high-frequency applications such as magnetic recording heads, wireless inductor cores, microwave absorbers have recently received much attention and extensively studied due to their high permeability [1][2][3][4][5][6][7]. One of the most important issues for these studies is how to tune the ferromagnetic resonance (FMR) frequency to meet the demand for specific high-frequency applications.…”

Soft magnetic properties and high frequency characteristics of FeM (M = B, Hf, Zr) and pure Fe films fabricated by oblique deposition

“…The highfrequency applications of magnetic thin films require the thin films to possess a high saturation magnetization and an appropriately large in-plane uniaxial anisotropy (IPUMA) [8][9][10][11] field to achieve a high cutoff frequency, which is the highest theoretically possible frequency of soft materials.…”