Effect of annealing conditions on structural and magnetic properties of 36Ni-64Fe laminates

Abstract

Different aspects of contemporary life directly or indirectly make use of magnetic materials, including both soft and hard magnets.Magnetically soft Nickel-Iron (Ni-Fe) alloys are used as magnetic core materials for the pulsed magnets of accelerators. Fe-based alloys are widely used as magnetic cores for accelerator and experiment magnets. For magnetization rates as high as 105 T/s to 107 T/s, crystalline materials would perform best in terms of minimizing losses. The processing conditions for Ni-Fe laminations and C-shaped punched cores having sizes of 70 mm × 70 mm × 0.1 mm in a hydrogen environment were optimized in this study. The structural, magnetic, and electrical characterizations of non-annealed and annealed Ni-Fe laminations were carried out under a hydrogen atmosphere by varying process parameters such as annealing as well as oxidation temperature and holding time. With the scanning Kelvin probe (SKP) method, the electrical properties, including work function, were examined. These characteristics were found to be correlated with the microstructural characteristics under various annealing conditions. Under various annealing conditions, magnetic characteristics such as remanence, coercivity, and saturation magnetization are measured. To enhance the magnetic performance of soft magnet cores after heat treatment, the microstructure-magnetic property correlation investigation is carried out.