Magneto-optical and magnetic properties in a Co/Pd multilayered thin film

Nwokoye, Chidubem; Bennett, L. H.; Torre, E. Della; Ghahremani, Mohammadreza; Narducci, Frank A.

doi:10.1016/j.jmmm.2016.07.046

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…D3 depicts the Kerr rotation of sample S1 when laser L2 is switched off at 60 K. The D3 curve contains no influence of the external laser beam from L2 on sample S1. We noticed the following: (i) The Kerr rotation hysteresis loop response increased significantly with a decrease in temperature, this effect of an increase in magnetization with temperature was first observed by [15] and is been previously recorded [14,16]; (ii) At the coercivity field, all the curves D1-3 showed no difference between each other; (iii) At all the applied field values, curves D1 and D3 showed a negligible difference and were almost identical while, curve D2 showed an increased value from the other curves.…”

Section: Resultssupporting

confidence: 66%

“…Furthermore, we noticed that the Kerr rotation of D5 was greater than D6, but less than D4. Thus, there is a coupling phenomenon occurring when the temperature is decreased to 9.5 K as opposed to when the temperature is at 60 K. Low temperature magnetic measurements on the Co/Pd sample with similar nanometer dimensions has been reported to have a magnon Bose-Einstein condensation (BEC) phenomenon occurring at temperatures below 35 K [14].…”

Section: Resultsmentioning

confidence: 99%

“…The Co/Pd test sample was grown by molecular beam epitaxy on a silicon dioxide substrate using electron beam evaporation. We followed a similar fabrication procedure illustrated in the work by Nwokoye, et al [14]. The test sample composition is: 22 nm Si < 100 > /SiO 2 substrate, 10 nm of Pd, (0.3 nm of Co and 1 nm of Pd) 15, 10 nm of Pd and 1.5 nm of Fe.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Quantum Entanglement of Magnons Confined in Multilayered Co/Pd Ferromagnets

Nwokoye¹,

Siddique²,

Bennett³

et al. 2017

Int J Magnetics Electromagnetism

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Quantum entanglement is a unique physical phenomenon that arises from the correlation between two or more quantum systems. The fundamental aspects of magnon entanglement have been theoretically studied. Developing technologies that exploits quantum entanglement will have enormous applications for sensors and quantum computing. In this paper, we discuss the results of an experimental study of magnon entanglement in multilayered Co/Pd ferromagnets. We observed an entanglement between the magnons in two spatially separated Co/Pd ferromagnets. Our findings will aid in developing novel magnonic devices.

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Quantum Entanglement of Magnons Confined in Multilayered Co/Pd Ferromagnets

Nwokoye¹,

Siddique²,

Bennett³

et al. 2017

Int J Magnetics Electromagnetism

View full text Add to dashboard Cite

show abstract

“…The obtained value is an order smaller than that of bulk Co (4.5 × 10 −21 J) but similar to that for a Co ultrathin film in previous works with a Pt=Co bilayer 20) and Pd=Co multilayer. 29) Figure 3 shows V G and the change in J, ΔJ=J(0 V), which was estimated from the slope of the T 3=2 dependence of M=M 0 following Bloch's T 3=2 law (B=M 0 ∝ J −3=2 ), as a function of cycle number. Figure 4 shows the V G dependence of the obtained change in J, ΔJ=J(0 V).…”

mentioning

confidence: 99%

Electric field effect on exchange interaction in ultrathin Co films with ionic liquids

Ishibashi

Yamada

Shiota

et al. 2018

Appl. Phys. Express

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Electric-field modulations of magnetic properties have been extensively studied not only for practical applications but also for fundamental interest. In this study, we investigated the electric field effect on the exchange interaction in ultrathin Co films with ionic liquids. The exchange coupling J was characterized from the direct magnetization measurement as a function of temperature using Pt/ultrathin Co/MgO structures. The trend of the electric field effect on J is in good agreement with that of the theoretical prediction, and a large change in J by applying a gate voltage was observed by forming an electric double layer using ionic liquids.

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Artifact-free optical spin–orbit torque magnetometry

Kim

Park

Whang

et al. 2019

Applied Physics Letters

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Here, we demonstrate an optical spin–orbit torque (SOT) measurement scheme that is free from artifacts such as the optic planar Hall effect (PHE) and the optic anomalous Nernst effect (ANE). Such PHE and ANE signals complicate the SOT analysis in the electrical harmonic measurement method. Our optical setup utilizes photoelastic modulation and balanced detection to measure the polar magneto-optic Kerr effect (pMOKE) signal exclusively. We verified the separation of the pMOKE signal in the Pt/Py bilayer sample with a sizable optic PHE. Our method uses a single measurement principle and reduces the analysis complexity, and thus could help expand the scope of SOT studies.

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Magneto-optical and magnetic properties in a Co/Pd multilayered thin film

Cited by 3 publications

References 19 publications

Quantum Entanglement of Magnons Confined in Multilayered Co/Pd Ferromagnets

Quantum Entanglement of Magnons Confined in Multilayered Co/Pd Ferromagnets

Electric field effect on exchange interaction in ultrathin Co films with ionic liquids

Artifact-free optical spin–orbit torque magnetometry

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