Ultrafast magnetization dynamics of spintronic nanostructures

Keatley, P. S.; Kruglyak, V. V.; Gangmei, P.; Hicken, R. J.

doi:10.1098/rsta.2010.0324

Cited by 20 publications

(12 citation statements)

References 106 publications

(145 reference statements)

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“…Dynamic magnetization behavior was studied ex situ using time-resolved magneto-optical Kerr effect (TRMOKE) magnetometry using an all-optical pump-probe technique. More details about the TRMOKE system can be found elsewhere [25][26][27]. Structural analysis was carried out using a Bede-D1 diffractometer with a CuKα source for grazing incidence x-ray reflectivity (XRR) to study layer thicknesses and interfacial structure and for x-ray diffraction (XRD) to analyze crystal structure; more information can be found elsewhere [28,29].…”

Section: Methodsmentioning

confidence: 99%

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

et al. 2016

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Reprinted with permission from the American Physical Society: Azzawi, S. and Ganguly, A. and Toka c, M. and Rowan-Robinson, R.M. and Sinha, J. and Hindmarch, A.T. and Barman, A. and Atkinson, D. (2016) 'Evolution of damping in ferromagnetic/nonmagnetic thin lm bilayers as a function of nonmagnetic layer thickness.', Physical review B., 93 (5). 054402 c 2016 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The evolution of damping in Co/Pt, Co/Au, and Ni 81 Fe 19 /Pt bilayers was studied with increasing nonmagnetic (NM) heavy-metal layer thicknesses in the range 0.2 nm t NM 10 nm, where t NM is the NM layer thickness. Magnetization precession was measured in the time domain using time-resolved magneto-optical Kerr effect magnetometry. Fitting of the data with a damped sinusoidal function was undertaken in order to extract the phenomenological Gilbert damping coefficient α. For Pt-capped Co and Ni 81 Fe 19 layers a large and complex dependence of α on the Pt layer thickness was observed, while for Au capping no significant dependence was observed. It is suggested that this difference is related to the different localized spin-orbit interaction related to intermixing and to d-d hybridization of Pt and Au at the interface with Co or Ni 81 Fe 19 . Also it was shown that damping is affected by the crystal structure differences in FM thin films and at the interface, which can modify the spin-diffusion length and the effective spin-mixing conductance. In addition to the intrinsic damping an extrinsic contribution plays an important role in the enhancement of damping when the Pt capping layer is discontinuous. The dependence of damping on the nonmagnetic layer thickness is complex but shows qualitative agreement with recent theoretical predictions.

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Section: Methodsmentioning

confidence: 99%

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

et al. 2016

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“…[http://dx.doi.org/10.1063/1.4883860] Picosecond magnetization dynamics are largely controlled by damped precessional processes, and consequently, magnetic damping has received significant research attention both for the fundamental physics involved 1 and for technological applications. 2 For spin-transfer torque magnetic random access memory (STT-MRAM) and magnonic devices, low damping facilitates a lower writing current and longer propagation of spin waves; higher damping is desirable for increasing the reversal rates and the coherent reversal of magnetic elements, as damping suppresses the precessional motion of the magnetization vector.…”

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Local control of magnetic damping in ferromagnetic/non-magnetic bilayers by interfacial intermixing induced by focused ion-beam irradiation

King

Ganguly

Burn

et al. 2014

Applied Physics Letters

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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“…Magnetic moments arise from the angular momentum of moving electronic charges, and so torques must be applied to supply or extract the angular momentum needed to change magnetic states, which may only be done at a finite rate. The field of ultrafast magnetization dynamics is explored in the article by Keatley et al [39], in which the ultimate speed limits on the operation of spintronic devices are considered.…”

Section: Physical Phenomenamentioning

confidence: 99%

New directions in spintronics

Marrows

Hickey

2011

Phil. Trans. R. Soc. A.

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Conventional microelectronics exploits only the charge degree of freedom of the electron. Bringing the spin degree of freedom to bear on sensing, radio frequency, memory and logic applications opens up new possibilities for 'more than Moore' devices incorporating magnetic components that can couple to an external field, store a bit of data or represent a Boolean state. Moreover, the electron spin is an archetypal two-state quantum system that is an excellent candidate for a solid-state realization of a qubit.

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Ultrafast magnetization dynamics of spintronic nanostructures

Cited by 20 publications

References 106 publications

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

Local control of magnetic damping in ferromagnetic/non-magnetic bilayers by interfacial intermixing induced by focused ion-beam irradiation

New directions in spintronics

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