Cavity enhancement of the magneto-optic Kerr effect for optical studies of magnetic nanostructures

Qureshi, Naser; Schmidt, Holger; Hawkins, Aaron R.

doi:10.1063/1.1774276

Cited by 44 publications

(44 citation statements)

References 18 publications

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“…The photonic effect can also be used to enhance the MOKE because of multiple interference of light within the magnetic multilayers [34][35][36] . Cavity enhancement of the MOKE has also been reported, in which a dielectric layer acts as a Fabry-Perot optical cavity [37][38][39] . Metamaterials, i.e., composite nanostructured materials, can also show enhancement of the MOKE [40][41][42] .…”

Section: Introductionmentioning

confidence: 99%

Enhanced magneto-optical Kerr effect at Fe/insulator interfaces

Takahashi

Maekawa

2017

Phys. Rev. B

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Using density functional theory calculations, we have found an enhanced magneto-optical Kerr effect in Fe/insulator interfaces. The results of our study indicate that interfacial Fe atoms in the Fe films have a low-dimensional nature, which causes the following two effects: (i) The diagonal component σxx of the optical conductivity decreases dramatically because the hopping integral for electrons between Fe atoms is suppressed by the low dimensionality. (ii) The off-diagonal component σxy of the optical conductivity does not change at low photon energies, but it is enhanced at photon energies around 2 eV, where we obtain enhanced orbital magnetic moments and spin-orbit correlations for the interfacial Fe atoms. A large Kerr angle develops in proportion to the ratio σxy/σxx. Our findings indicate an efficient way to enhance the effect of spin-orbit coupling at metal/insulator interfaces without using heavy elements.

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Section: Introductionmentioning

confidence: 99%

Enhanced magneto-optical Kerr effect at Fe/insulator interfaces

Takahashi

Maekawa

2017

Phys. Rev. B

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“…No additional dielectric layers have been added to enhance the Kerr signal. 6 The membranes are not necessary for the MOKE measurements but allow for additional time resolved scanning transmission X-ray microscopy experiments on the same sample.…”

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confidence: 99%

Switching probabilities of magnetic vortex core reversal studied by table top magneto optic Kerr microscopy

Dieterle

Gangwar

Gräfe

et al. 2016

Applied Physics Letters

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We have studied vortex core reversal in a single submicron Permalloy disk by polar Kerr microscopy. A sophisticated lock-in-technique based on repetitive switching of the magnetic vortex core and a continuous calibration allows for a reliable determination of the switching probability. This highly sensitive method facilitates the detection of a change in the magnetic moment of the tiny magnetic vortex core which is about 1.5 × 10−17 A m2. We have investigated vortex core switching caused by excitation of the vortex core gyromode with varying frequencies and amplitudes. The frequency range in which switching occurs was found to broaden with increasing excitation amplitude, whereby the highest frequency in this range shifts stronger to higher frequencies than the lowest frequency to lower frequencies. The experimental results are in good agreement with micromagnetic simulations.

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“…MO enhancement up to a factor of 4 has been obtained using a single dielectric lm, 7) and has reached a value of approximately 16 (θ K ~ 1.6 ) by using a SiO 2 dielectric lm with a thin gold-coating layer. 9) In our system, the CoPt layer acts as a dual functional layer, ful lling the roles of both magnetic and coating lms. As discussed in Section B, we obtained an extraordinary enhancement factor of approximately 200 (θ K ~ 20 ) for a CoPt/AZO/Ag stacked lm.…”

Section: Effect Of a Zno Intermediate Layer On Copt/agmentioning

confidence: 99%

“…Similarly, MO cavities consisting of stacked layer structure enhance the MO effect by multiple re ections of light inside the structure. [6][7][8][9][10] The cavities are typically formed by a re ective layer as a mirror, magnetic layer, a spacer and a capping layer. In recent years, it has been reported that the MO cavities indicate a relatively large Kerr rotation angle reaching to several degrees.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Optical Enhancement and Chemical Sensing Applications of Perpendicular Magnetic CoPt/Ag Stacked Structures with a ZnO Intermediate Layer

2016

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The magneto-optical (MO) properties of perpendicular magnetic Co 80 Pt 20 /Ag stacked lms with ZnO intermediate layers of different thickness were investigated by polar Kerr measurements. The insertion of a thin ZnO layer at the CoPt/Ag interface improved the perpendicular magnetic properties and MO enhancement at the plasma edge of Ag. The CoPt/Ag stacked lms with a 2-nm-thick ZnO layer exhibited an ideal square out-of-plane hysteresis loop with a relatively large Kerr angle of approximately 1.4 in the ultraviolet region. The peak position of the MO plasma enhancement shifted to longer wavelength as the thickness of the ZnO layer increased, and a new peak appeared consistent with the band-gap energy of ZnO. Moreover, the CoPt/ZnO/Ag stacked layer acted as a Fabry-Pérot etalon when the thickness of the ZnO layer was the sub-wavelength of incident light. As a result, a MO cavity was realized in the stacked lms, and an ideal square MO loop with a large Kerr rotation angle of approximately 20 was obtained in the visible region. The MO enhancement factor reached approximately 200. We demonstrated that the stacked lms were sensitive to changes in the optical conditions at the lm surface. The developed MO cavity can act as a highly accurate chemical and biological sensing system under simple measurement conditions.

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Cavity enhancement of the magneto-optic Kerr effect for optical studies of magnetic nanostructures

Cited by 44 publications

References 18 publications

Enhanced magneto-optical Kerr effect at Fe/insulator interfaces

Enhanced magneto-optical Kerr effect at Fe/insulator interfaces

Switching probabilities of magnetic vortex core reversal studied by table top magneto optic Kerr microscopy

Magneto-Optical Enhancement and Chemical Sensing Applications of Perpendicular Magnetic CoPt/Ag Stacked Structures with a ZnO Intermediate Layer

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