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Current driven spin oscillation in PMA/IMA composite nanowires-a novel spin torque based nano-oscillators
1The State Key Laboratory of Refractories and Metallurgy, School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China.
Nanotechnology
|February 20, 2019
Summary
Composite nanowires with mixed magnetic anisotropies exhibit tunable spin wave oscillations. Applied currents and fields control frequency and amplitude, showing promise for nano-oscillator applications.
Area of Science:
- Condensed matter physics
- Materials science
- Nanotechnology
Background:
- Composite nanowires integrate perpendicular magnetic anisotropy (PMA) and in-plane magnetic anisotropy (IMA) regions.
- Understanding spin dynamics in such heterostructures is crucial for developing advanced spintronic devices.
Purpose of the Study:
- To investigate the spin dynamics in composite nanowires with both PMA and IMA regions.
- To explore the excitation and propagation of spin waves driven by electric currents.
- To analyze the tunability of magnetic moment oscillations.
Main Methods:
- Fabrication of composite nanowires with distinct magnetic anisotropy regions.
- Application of controlled electrical currents to excite spin dynamics.
- Analysis of spin wave propagation and magnetic moment oscillations.
- Systematic variation of current density and applied magnetic field.
Main Results:
- Spin waves are successfully excited and propagate along the nanowires, inducing sustained magnetic moment oscillations.
- Oscillation frequency and amplitude are strongly dependent on the length of the in-plane magnetic anisotropy (IMA) region (LIMA).
- Tuning of oscillation characteristics is achieved through applied current and magnetic field.
- Simultaneous achievement of high frequencies and amplitudes is possible with applied field assistance.
Conclusions:
- Composite nanowires with mixed magnetic anisotropies offer a promising platform for controlled spin dynamics.
- The tunability of spin wave oscillations by current and field makes them suitable for nano-oscillator applications.
- Ease of manufacture enhances the potential of these composite nanowires for technological implementation.
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