Microstructural evolution and correlated magnetic domain configuration of nanoparticles embedded in a single crystal of Cu-75-Ni-20-Fe-5 alloy

作者：Kim Jun Seop; Taniuchi Toshiyuki^*; Mizuguchi Masaki; Shin Shik; Takanashi Koki; Takeda Mahoto

来源：Journal of Physics D: Applied Physics , 2016, 49(33): 335006.

DOI：10.1088/0022-3727/49/33/335006

• Cu-Ni-Fe alloy
• single crystal
• microstructure
• magnetic-domain configuration
• PEEM

We have investigated the microstructural evolution and magnetic domain configurations in nano-scale Fe-Ni rich precipitates formed in a single-crystal specimen of Cu-20at%Ni-5at%Fe alloy on isothermal annealing at 873 K and 973 K, using a combination of transmission electron microscopy (TEM), electron backscattering diffraction, field-emission scanning electron microscopy (FE-SEM), and laser-based photoemission electron microscopy (laser-PEEM). The TEM and FE-SEM observations showed that small, spherical solute-rich particles formed randomly in the initial stage of the precipitation, but on isothermal annealing, cubic, rectangular, plate-shaped and rod-shaped precipitates appeared and aligned along the < 1 0 0 > directions in the copper-rich matrix. Laser-PEEM was applied to single-crystal specimens of the alloy and allowed direct observations of magnetic domain configurations in individual ferromagnetic particles at the nanometer scale. This revealed that cubic particles of size approximately 50-60 nm consist of single magnetic domains, but particles of size 100 nm have a closed spin structure (e.g. vortex or multiple domains).

• 出版日期2016-8-24