Sbiaa R, Shaw J M, Nembach H T, Al Bahri M, Ranjbar M, Åkerman J, Piramanayagam S N
Department of Physics, Sultan Qaboos University, PO Box 36, PC 123, Muscat, Oman.
Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO 80305, USA.
J Phys D Appl Phys. 2016;49(42). doi: https://doi.org/10.1088/0022-3727/49/42/425002.
Multilayers of [Co/Ni()/Co/Pt] with varying Ni thickness were investigated for possible use as a free layer in magnetic tunnel junctions and spintronics devices. The thickness of the Ni sub-layer was varied from 0.3 nm to 0.9 nm and the resulting magnetic properties were compared with (Co/Ni) and (Co/Pt) multilayers. As determined from magnetic force microscopy, magnetometry and ferromagnetic resonance measurements, all multilayers exhibited perpendicular magnetic anisotropy. Compared with (Co/Pt) multilayers, the sample with of 0.9 nm showed almost the same anisotropy field of = 1.15 T but the damping constant was 40% lower. These characteristics make these multilayers attractive for spin torque based magnetoresistive devices with perpendicular anisotropy.
研究了具有不同镍厚度的[钴/镍（）/钴/铂]多层膜作为磁隧道结和自旋电子器件自由层的潜在用途。镍子层的厚度在0.3纳米至0.9纳米之间变化，并将由此产生的磁性能与（钴/镍）和（钴/铂）多层膜进行比较。根据磁力显微镜、磁强计和铁磁共振测量确定，所有多层膜均表现出垂直磁各向异性。与（钴/铂）多层膜相比，镍厚度为0.9纳米的样品显示出几乎相同的各向异性场，为 = 1.15特斯拉，但阻尼常数低40%。这些特性使这些多层膜对具有垂直各向异性的基于自旋扭矩的磁阻器件具有吸引力。
