Laser Induced Magnetization Reversal for Detection in Optical Interconnects

Azim, Zubair Al; Fong, Xuanyao; Ostler, Thomas; Chantrell, R.W.; Roy, Kaushik

doi:10.1109/led.2014.2364232

Cited by 13 publications

(7 citation statements)

References 14 publications

(29 reference statements)

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“…Very recently, ultrafast thermally induced magnetization switching (TIMS) 8 has been observed and received wide attention due to its potential application in magnetic recording and optical interconnects 11 . This switching process occurs when an applied sub-picosecond heat pulse causes the magnetic state to reverse without any external or implicit magnetic field or circularly polarized light.…”

Section: Introductionmentioning

confidence: 99%

Thermally induced magnetization switching in Gd/Fe multilayers

Ostler

Chantrell

2016

Phys. Rev. B

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A theoretical model of Gd/Fe multilayers is constructed using the atomistic spin dynamics formalism. By varying the thicknesses and number of layers we have shown that a strong dependence of the energy required for thermally induced magnetization switching (TIMS) is present; the larger the number of interfaces, the lower the energy required. The results of the layer resolved dynamics show that the reversal process of the multilayered structures, similarly to a GdFeCo alloy is driven by the antiferromagnetic interaction between the transition metal and rare earth components. Finally, whilst the presence of the interface drives the reversal process we show here that the switching process does not initiate at the surface but from the layers furthest from it; a departure from the alloy behavior which expands the classes of material types exhibiting TIMS.

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Section: Introductionmentioning

confidence: 99%

Thermally induced magnetization switching in Gd/Fe multilayers

Ostler

Chantrell

2016

Phys. Rev. B

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“…Using a SPICE simulation, we have evaluated the dissipated energy at the receiver to be 0.124 pJ/bit. This is ∼ 4× lower than the required energy dissipation in the receiver using laser heat induced reversal [25]. The energy consumption is also ∼ 5× lower than the advanced Ge photodiode based receivers shown in [26] and [27], which was reported to be the lowest among photodiode based receivers.…”

Section: B Performance Evaluationmentioning

confidence: 82%

Optical Receiver With Helicity-Dependent Magnetization Reversal

Azim

Ostler

et al. 2019

IEEE Trans. Magn.

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In this work, we propose helicity-dependent switching (HDS) of magnetization of Co/Pt for energy efficient optical receiver. Designing a low power optical receiver for optical-to-electrical signal conversion has proven to be very challenging. Current day receivers use a photodiode that produces a photocurrent in response to input optical signals, and power hungry trans-impedance amplifiers are required to amplify the small photocurrents. Here, we propose light helicity induced switching of magnetization to overcome the requirement of photodiodes and subsequent trans-impedance amplification by sensing the change in magnetization with a magnetic tunnel junction (MTJ). Magnetization switching of a thin ferromagnet layer using circularly polarized laser pulses have recently been demonstrated which shows one-to-one correspondence between light helicity and the magnetization state. We propose to utilize this phenomena by using digital input dependent circularly polarized laser pulses to directly switch the magnetization state of a thin Co/Pt ferromagnet layer at the receiver. The Co/Pt layer is used as the free layer of an MTJ, the resistance of which is modified by the laser pulses. With the one-to-one dependence between input data and output magnetization state, the MTJ resistance is directly converted to digital output signal. Our device to circuit level simulation results indicate that, HDS based optical receiver consumes only 0.124 pJ/bit energy, which is much lower than existing techniques.

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“…However, high frequency generally means short life-times of excitations making them difficult to utilise. Understanding the fundamental physics of energy transfer in spin textures via magnon flows and domain wall motion are critical for information processing [1,2] in fields such as magnonics [3] and spintronics [4][5][6][7]. Because magnonic currents rely on localised magnetic moments, the motion of itinerant electrons, which come with large amounts of Joule heating losses, is not required and, importantly, the materials are not restricted to metallic system.…”

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confidence: 99%