Angular control of multi-mode resonance frequencies in obliquely deposited CoZr thin films with rotatable stripe domains

We investigate the angular-dependent multi-mode resonance frequencies in CoZr magnetic thin films with a rotatable stripe domain structure.A variable range of multi-mode resonance frequencies from 1.86 GHz to 4.80 GHz is achieved by pre-magnetizing the CoZr films along different azimuth directions,which can be ascribed to the competition between the uniaxial anisotropy caused by the oblique deposition and the rotatable anisotropy induced by the rotatable stripe domain.Furthermore,the regulating range of resonance frequency for the CoZr film can be adjusted by changing the oblique deposition angle.Our results might be beneficial for the applications of magnetic thin films in microwave devices.

Effect of neodymium and yttrium addition on microstructure and DC soft magnetic property of dual-phase FeCoNi(CuAl)_(0.8)high-entropy alloy

The correlation between the microstructure and soft magnetic properties under the direct current(DC)mode of dual-phase FeCoNi(CuAl)_(0.8)RE_(0.05)(RE=Nd,Y)high-entropy alloys(HEAs)was investigated.Xray diffraction(XRD)and electron backscattered diffraction(EBSD)results show that all samples consist of face-centered cubic(FCC)and body-centered cubic(BCC)phases.In comparison to the volume fraction of BCC phase of the RE-free HEA(25.3%),Nd and Y additions dramatically increase it to 42.0%and 43.3%,which leads to an increase of the saturation magnetization.RE addition reduces the average grain size from 7.26 wm of the RE-free HEA to 5.42μm of RE=Nd HEA and 4.88μm of RE=Y HEA.Stripe magnetic domain structure is observed in both FCC and BCC phases in the RE-free and RE-containing HEAs.The additives of Nd and Y both decrease the stripe pattern width in FCC and BCC phases.The refined structure and finely spaced stripe domain by RE addition can decrease the remanence.Compared with the RE-free HEA,RE addition can effectively enhance the DC soft magnetic property by decreasing the remanence,the coercivity,and the hysteresis loss.