Charge-To-Spin Conversion Efficiency in Ferromagnetic Nanowires by Spin Torque Ferromagnetic Resonance: Reconciling Lineshape and Linewidth Analysis Methods

Xu, Jun-Wen; Kent, Andrew D.

doi:10.1103/physrevapplied.14.014012

Cited by 16 publications

(12 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is worth mentioning that the lineshape method based on Eq. 2 only provides an estimation of the upper limit of J S /J C due to the resonance-driven spin pumping effect from Py to Pt as reported in a previous work [46,49].…”

Section: St-fmr Measurementsmentioning

confidence: 92%

“…Following the aforementioned procedure, we prepared a series of epitaxial Pt (10)/ Py (8) (Py, Ni 81 Fe 19 ) samples for ST-FMR measurements and both epitaxial Pt (111) (5)/Co(0.8)/Ni(1) and polycrystalline Pt (15)/ Co(0.8)/Ni(1) samples with perpendicular magnetic anisotropy for harmonic measurements (thickness in nanometer throughout the text unless otherwise stated). Note that the choice of Py as the FM layer is motivated by its wide application as an efficient spin detector [15,[45][46][47][48][49][50] and the usage of Co/Ni is due to its spontaneous perpendicular magnetic anisotropy, a prerequisite for harmonic measurements [51,52].…”

Section: Sample Growth and Characterizationmentioning

confidence: 99%

“…Furthermore, reversing the polarity of the external magnetic field that saturates Py magnetization will also lead to the sign change of the observed signals, as illustrated in Figure 3. Quantitatively, J S /J C can be obtained from the slope of the DC-dependent resonance linewidth of Py as follows [15,23,49]:…”

Section: St-fmr Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Crystalline Orientation–Dependent Spin Hall Effect in Epitaxial Platinum

2022

View full text Add to dashboard Cite

We report on the spin Hall effect in epitaxial Pt films with well-defined crystalline (200), (220), and (111) orientations and smooth surfaces. The magnitude of the spin Hall effect has been determined by spin–torque ferromagnetic resonance measurements on epitaxial Pt/Py heterostructures. We observed a 54% enhancement of the charge-to-spin conversion efficiency of the epitaxial Pt when currents are applied along the in-plane <002> direction. Temperature-dependent harmonic measurements on epitaxial Pt/Co/Ni heterostructures compared to a polycrystalline Pt/Co/Ni suggest the extrinsic mechanism underlying spin Hall effect in epitaxial Pt. Our work contributes to the development of energy-efficient spintronic devices by engineering the crystalline anisotropy of non-magnetic metals.

show abstract

Section: St-fmr Measurementsmentioning

confidence: 92%

Section: Sample Growth and Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Crystalline Orientation–Dependent Spin Hall Effect in Epitaxial Platinum

2022

View full text Add to dashboard Cite

show abstract

“…In order to have a large resistance response, we apply an in-plane field at to the current direction. In our measurements, we fix the rf frequency and sweep the external magnetic field from high to low field, 0.6 to 0 T. Further, we modulate the field to increase the signal-to-noise ratio, with a modulation amplitude much less than the resonance linewidth ( ) 21 , 28 .…”

Section: Methodsmentioning

confidence: 99%

“…The curves are offset by 2 µV to make the different frequency spectra visible and align their baseline with the rf frequency on the right-hand axis. The spectra are then fit to the sum of the derivative of Lorentzian and anti-Lorentzian to determine the resonance parameters 21 . The resulting resonance field is indicated by the solid squares in the figure . A fit to the rf frequency-resonance field dispersion with the Kittel model for this geometry 22 is shown as the pink curve in Fig.…”

Section: Nanoconstriction Responsementioning

confidence: 99%

A quantum material spintronic resonator

Chen

Vargas

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

In a spintronic resonator a radio-frequency signal excites spin dynamics that can be detected by the spin-diode effect. Such resonators are generally based on ferromagnetic metals and their responses to spin torques. New and richer functionalities can potentially be achieved with quantum materials, specifically with transition metal oxides that have phase transitions that can endow a spintronic resonator with hysteresis and memory. Here we present the spin torque ferromagnetic resonance characteristics of a hybrid metal-insulator-transition oxide/ ferromagnetic metal nanoconstriction. Our samples incorporate $${\mathrm {V}}_2{\mathrm {O}}_3$$ V 2 O 3 , with Ni, Permalloy ($${\hbox {Ni}}_{80}{\hbox {Fe}}_{20}$$ Ni 80 Fe 20 ) and Pt layers patterned into a nanoconstriction geometry. The first order phase transition in $${\mathrm {V}}_2{\mathrm {O}}_3$$ V 2 O 3 is shown to lead to systematic changes in the resonance response and hysteretic current control of the ferromagnetic resonance frequency. Further, the output signal can be systematically varied by locally changing the state of the $${\mathrm {V}}_2{\mathrm {O}}_3$$ V 2 O 3 with a dc current. These results demonstrate new spintronic resonator functionalities of interest for neuromorphic computing.

show abstract

Spin Oscillators

Tu¹,

Zeng²

2022

Spintronics

View full text Add to dashboard Cite

Charge-To-Spin Conversion Efficiency in Ferromagnetic Nanowires by Spin Torque Ferromagnetic Resonance: Reconciling Lineshape and Linewidth Analysis Methods

Cited by 16 publications

References 29 publications

Crystalline Orientation–Dependent Spin Hall Effect in Epitaxial Platinum

Crystalline Orientation–Dependent Spin Hall Effect in Epitaxial Platinum

A quantum material spintronic resonator

Spin Oscillators

Contact Info

Product

Resources

About