Capturing dual behavior of the parallel coercivity in FeNi/Cu nanowire arrays by fine-tuning of segment thicknesses

چکیده مقاله

The emergence of novel effects such as giant magnetoresistance and magnetothermopower in single nanowires (NWs) and multilayered NWs (MNWs) makes it necessary to comprehensively understand and distinguish between their magnetic behavior and subtle characteristics. Herein, experimental fine-tuning of both ferromagnetic and non-magnetic segment thicknesses in 50 nm diameter FeNi/Cu MNW arrays from T_FeNi = 25–260 nm and T_Cu = 2–23 nm, respectively, enables us to find the threshold T_Cu, below which the coercive field behavior of rod-like MNW systems magnetically saturated parallel to their long axis shows a continuous decreasing trend, which is similar to that of single NWs with integrated structure. This is in turn accompanied with enhanced magnetizing- and demagnetizing-type interactions as evidenced by first-order reversal curve (FORC) analysis. FORC measurements of disk-shaped to …