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MMM 2022

November 07, 2022

Minneapolis, United States

Effects of Permalloy Cobalt Cosputtering in a Nanowire Structure on Magnetic Fluctuation and Auto

Spin torque nano oscillator(STNO) and spin Hall nano oscillator(SHNO) are the promising devices to generate spin wave with thermal stability and low power consumption. 1,2 But the spin wave has in nature the low power density for device applications. Thus, various spin wave excitation methods have been studied, such as synchronization of auto-oscillation via multiple SHNO array 4-7 and utilizing high spin Hall angle in a heavy metal. 8 Here, we designed a permalloy (Py) ferromagnetic layer in a rectangular bar type for spin wave excitation by auto oscillation and investigated the effects of a transition metal (Co) alloying on the excitation efficiency. The magnetic fluctuation in bar type layers of Py1-xCox (x = 0, 0.11, 0.21, 0.29, and 0.40), fabricated by Py-Co cosputtering, is estimated from micro-Brillouin light scattering (μ-BLS) spectroscopy data, as shown in Fig. 1. And the threshold current for auto oscillation in the bar layers is estimated from the current dependence of integral intensity of the spectra. It is found that Py-Co cosputtering reduces the threshold current for auto oscillation, e.g., 27.3% for Py1-xCox (x = 0.21), compared with that of Py layer. It is conjectured that the cosputtering enhances the spin Hall transparency while it causes almost no change in the effective Gilbert damping constant in the layer. Details will be discussed in the poster presentation and conference proceeding paper.
1 J. Wunderlich, B. Kaestner, and T. Jungwirth, Phys Rev Lett 94, 047204 (2005).
2 J. Torrejon et al., Nature 547, 428 (2017).
3 A. Slavin and V. Tiberkevich, IEEE Transactions on Magnetics 45, 1875 (2009).
4 Y. Ou, D. C. Ralph, and R. A. Buhrman, Phys Rev Lett 120, 097203 (2018).
5 Y. Yin et al., Physical Review B 92 (2015).
6 M. A. W. Schoen, D. Thonig, and J. M. Shaw, Nature Physics 12, 839 (2016).
7 Y. Fu et al., IEEE Transactions on Magnetics 45, 4004 (2009).
8 H. Mazraati et al., Applied Physics Letters 109 (2016).

Figure 1. Brillouin light scattering (BLS) intensity spectra of Py1-xCox (x = 0.21) (Py = permalloy) nanowires with various applied DC currents of 3.5, 4.0, 4.5, 5.0 and 5.5 mA

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