Quantitative analysis of spin wave dynamics in ferrimagnets across compensation points

Haltz, Eloi; Sampaio, João; Krishnia, Sachin; Berges, Léo; Weil, Raphaël; Mougin, A.; Thiaville, A.

doi:10.1103/physrevb.105.104414

Cited by 8 publications

(4 citation statements)

References 31 publications

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“…In contrast to the FMR mode, the EXM frequency vanishes at the angular momentum compensation point. The change in sign in frequency predicted by the dispersion relation indicates an intriguing change in handedness of the oscillation, which has been experimentally verified by Brillouin light scattering [41,42]. The effective damping parameter α eff in this system has been calculated to show a maximum at L comp for both FMR and EXM modes [40].…”

Section: Spin Resonance Modessupporting

confidence: 55%

Exploring terahertz-scale exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents

2023

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Section: Spin Resonance Modessupporting

confidence: 55%

Exploring terahertz-scale exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents

2023

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Section: Spin Resonance Modesmentioning

confidence: 62%

Exploring THz exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents

Hintermayr¹,

Hees²,

Koopmans³

2023

Preprint

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Using spin currents generated by fs laser pulses, we demonstrate excitation of GHz ferromagnetic resonance and THz ferrimagnetic exchange resonances in Co/Gd/Co/Gd multilayers by timeresolved magneto-optic Kerr effect measurements. Varying the Gd layer thickness allows for a tuning of the resonance spectrum by manipulating the total angular momentum and strength of effective exchange fields between the antiferromagnetically coupled layers. Close to the compensation point of angular momentum, a minimum in the frequency of the exchange-dominated mode and a maximum in the frequency of the ferromagnetic resonance mode is observed. Finally, to gain better understanding of the excitation mechanism, we analyze the anomalous variation in the measured exchange mode amplitude as a function of its frequency. A peak in this amplitude in the vicinity of the compensation point of angular momentum is explained using a macrospin model, taking nonlinear effects at finite precession amplitudes into account.

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“…This merit also makes ferrimagnets more attractive than antiferromagnets considering that effective controllability of an antiferromagnetic texture is quite challenging at the current stage [5][6][7][8][9][10][11]. Besides, fast FiM dynamics around T A comparable to antiferromagnets has been confirmed both theoretically and experimentally, noting that spin dynamics of magnets depends closely on their angular momentum [12][13][14].…”

Section: Introductionmentioning

confidence: 82%

Strain-induced domain wall motion in ferrimagnetic nanowire

Liu,

Liu

et al. 2024

J. Phys. D: Appl. Phys.

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Controllable magnetic domain walls in ferrimagnets offer great promise as information carriers for future spintronic devices. It is crucial to find low-power-consuming and efficient methods of controlling domain walls. In this work, we propose to use the strain to drive the wall motion in ferrimagnets, and we theoretically reveal the important role of the net angular momentum. When the strain is applied, an anisotropy gradient is induced and effectively drives the wall motion. For a nonzero net angular momentum, the precession torques acting on the two sublattices cannot cancel out each other, which induces a rotation of the wall plane and speed down the wall propagation. Furthermore, the wall dynamics depends on several internal and external parameters, which allows one to manipulate the wall motion through tuning these parameters. Our work provides clear insight into the strain-induced domain wall motion in ferrimagnets, which is meaningful for future spintronic experiments and applications.

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Quantitative analysis of spin wave dynamics in ferrimagnets across compensation points

Cited by 8 publications

References 31 publications

Exploring terahertz-scale exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents

Exploring terahertz-scale exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents

Exploring THz exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents

Strain-induced domain wall motion in ferrimagnetic nanowire

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