Microstructure, magnetic domains and magnetic properties of Ti/Fe/Ni81Fe19/Fe/Ti multilayer films by obliquely deposition.

The metallic magnetic thin films are widely used in high-frequency magnetic devices, the reliability of which greatly depends on the saturation magnetization (M s) and resonance frequency (f r) of the films. However, increasing the operating frequency of the magnetic thin film is extremely challenging. This study investigates the microstructure, magnetic domains and magnetic properties of obliquely deposited Ti/Fe/Ni 81 Fe 19 /Fe/Ti multilayer films. The coercivity distribution of the deposited films is investigated by first order reversal curve (FORC) measurements. The result of static magnetic properties revealed the in-plane uniaxial anisotropy with a high anisotropy field (H k) up to 495 Oe. A magneto-optical Kerr microscope image displayed the multi-step magnetization reversal processes at different oblique angles. Complex permeability spectra indicated that the resonance frequency increases from 1.27 to 4.71 GHz as the deposition angle is increased from 0° to 25°. Thus, Ti/Fe/Ni 81 Fe 19 /Fe/Ti multilayer film with tunable magnetic performances is one of the good candidate materials for microwave devices. • This study investigates the microstructure, magnetic domains and magnetic properties of Ti/Fe/Ni 81 Fe 19 /Fe/Ti films. • The self-shadowing effect is observed in the films deposited at 15°, which showed an obvious columnar structure. • The dynamic magnetic properties show that the oblique deposition angle can tune the f r of samples from 1.27 to 4.71 GHz. [ABSTRACT FROM AUTHOR]