title: Static and Dynamic Magnetization of Gradient FeNi Alloy Nanowire.
abstract: FeNi binary nanowires with gradient composition are fabricated by the electrodeposition method. The energy dispersive spec-trometer line-sweep results show that the composition changes gradually along the wire axis. The gradient FeNi nanowires exhibit polycrystalline and crystal twinning at different areas along the nanowire axis, with a textured face-centered cubic structure. The static and dynamic magnetization properties are characterized by a hysteresis loop and ferromagnetic reso-nance with pumping frequencies from 12- 40 GHz. The linear dispersion of the pumping frequency vs: the resonance field has been observed with the applied bias field higher than the saturation field, corresponding to the hysteresis loop. The field-sweep linewidths decrease with increasing pumping frequency, and the frequency-sweep linewidths stay nearly constant at the unsaturated region. The linewidth is a Gilbert type at the saturated state, with damping of 0.035 ± 0.003. Compared with the damping of the homogeneous composition FeNi nanowire (a = 0.044 ± 0.005), the gradient FeNi nanowire may have less eddy current damping, which could make it an alternative candidate for spintronics and microstrip antennas.
authors: School of Materials Science and Engineering, Beihang University, Beijing 100191, China.|Materials Science Engineering, Department of Applied Physics Applied Mathematics, Columbia University, New York 10027, USA.
authors: Haozhe
authors: H
authors: Yang
authors: Materials Science Engineering, Department of Applied Physics Applied Mathematics, Columbia University, New York 10027, USA.
authors: Yi
authors: Y
authors: Li
authors: School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
authors: Min
authors: M
authors: Zeng
authors: Materials Science Engineering, Department of Applied Physics Applied Mathematics, Columbia University, New York 10027, USA.
authors: Wei
authors: W
authors: Cao
authors: Materials Science Engineering, Department of Applied Physics Applied Mathematics, Columbia University, New York 10027, USA.
authors: William E
authors: WE
authors: Bailey
authors: School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
authors: Ronghai
authors: R
authors: Yu