Antidamping spin-orbit torques in epitaxial-Py(100)/beta-Ta

作者：Tiwari, Dhananjay; Behera, Nilamani; Kumar, Akash; Durrenfeld, Philipp; Chaudhary, Sujeet; Pandya, D. K.; Akerman, Johan; Muduli, P. K.^*

来源：Applied Physics Letters, 2017, 111(23): 232407.

DOI：10.1063/1.5007202

• OSCILLATOR DRIVEN
• NANO-OSCILLATOR
• SYSTEM
• LAYER

We perform spin torque ferromagnetic resonance measurements on the Si(100)/TiN(100)/epi-Py(100)/beta-Ta system. We demonstrate current induced modulation of the Gilbert damping constant, which is about 30% for a current density of 6.25 x 10(9) A/m(2). We show that the observed modulation of the Gilbert damping constant cannot be explained by spin transfer torques arising from the spin Hall effect of the beta-Ta layer. An additional mechanism such as antidamping spinorbit torque resulting from the interface or the crystalline structure of Py thin films needs to be considered. Published by AIP Publishing.

• 出版日期2017-12-4
• 单位南京大学