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Sklenar, Joseph ; Zhang, Wei ; Jungfleisch, Matthias Benjamin ; Hoffmann, Axel ; Jaffrès, Henri ; Drouhin, Henri-Jean ; Wegrowe, Jean-Eric ; Razeghi, Manijeh ( , Proceedings of SPIE)It was recently demonstrated in bilayers of permalloy and platinum, that by combining spin torques arising from the spin Hall effect with Oersted field-like torques, magnetization dynamics can be induced with a directional preference.1 This “unidirectional” magnetization dynamic effect is made possible by exploiting the different even and odd symmetry that damping-like and field-like torques respectively have when magnetization is reversed. The experimental method used to demonstrate this effect was the spin-torque ferromagnetic (ST-FMR) resonance technique; a popular tool used in the phenomenological quantification of a myriad of damping-like and field-like torques. In this report, we review the phenomenology which is used to describe and analyze the unidirectional magnetization dynamic effect in ST-FMR measurements. We will focus on how the asymmetry in the dynamics also is present in the phase angle of the magnetization precession. We conclude by demonstrating a utility of this directional effect; we will outline an improved experimental method that can be used to distinguish a phase-shifted field-like torque in a ST-FMR experiment from a combination of field-like and damping-like torques.more » « less
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Jiang, Wanjun ; Zhang, Sheng ; Wang, Xiao ; Phatak, Charudatta ; Wang, Qiang ; Zhang, Wei ; Jungfleisch, Matthias Benjamin ; Pearson, John E. ; Liu, Yizhou ; Zang, Jiadong ; et al ( , Physical Review B)
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Lendinez, Sergi ; Li, Yi ; Wu, Weipeng ; Taghipour Kaffash, Mojtaba ; Zhang, Qi ; Zhang, Wei ; Pearson, John E. ; Divan, Ralu ; Schaller, Richard D. ; Hoffmann, Axel ; et al ( , Spintronics XII)