Magneto‐optical Materials

Kleemann, W.

doi:10.1002/9780470022184.hmm424

Cited by 6 publications

(3 citation statements)

References 219 publications

(228 reference statements)

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“…However, transverse MOKE experiments can be simpler, at least when utilizing traditional measurement set-ups, given that they are mere intensity measurements. Due to this simple operation, they are also particularly suitable for applications [3,30]. Moreover, the T-MOKE geometry having its optical observation plane oriented perpendicular to the magnetic field allows for a physical separation of optical elements and magnetic field generating components, which makes design and engineering experimental setups simpler.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive transverse magneto-optical Kerr effect measurements using an effective ellipsometric detection scheme

Oblak¹,

Riego²,

Garcia-Manso³

et al. 2020

J. Phys. D: Appl. Phys.

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We present a new methodology that enables a significant sensitivity improvement for transverse magneto-optical Kerr effect (T-MOKE) detection. For this purpose, we developed a novel measurement scheme, in which the polarization detection conditions are changed during the measurement sequence in a pre-defined way. An analytical expression of the associated T-MOKE signal pattern was derived, which allowed us to analyze and classify our experimental data in a straightforward way. Furthermore, this new measurement approach enables the identification of noise and false background signals that might be generated by the sample under investigation, the environment or the detection system itself and it provides a pathway to unambiguously separate all these effects from true T-MOKE signals. These capabilities significantly increase the sensitivity and robustness of T-MOKE detection. The method enabled us to measure magneto-optical signals for samples that are paramagnetic at room temperature or exhibit really small magneto-optical responses, even in the presence of false signals that were far larger in size. Our new methodology was integrated into a scanning wafer tool, which allows for nondestructive, laterally resolved surface characterization measurements and even has the capability of measuring optical and magneto-optical properties simultaneously.

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Section: Introductionmentioning

confidence: 99%

Ultrasensitive transverse magneto-optical Kerr effect measurements using an effective ellipsometric detection scheme

Oblak¹,

Riego²,

Garcia-Manso³

et al. 2020

J. Phys. D: Appl. Phys.

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“…The operating bandwidth can be about 4 GHz in the microwave frequency range. This scheme could be further extended to higher or even optical frequencies when magneto-optical materials are used [24]. The broadband one-way waveguide opens up an avenue towards many practical applications of unidirectional wave propagation, such as information transmission and photonic diodes.…”

Section: Discussionmentioning

confidence: 99%

Fusing electromagnetic one-way edge states to achieve broadband unidirectional wave transmission

Li¹,

Wu²,

Poo³

et al. 2014

J. Opt.

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There exist two types of electromagnetic (EM) one-way edge states in magnetic photonic crystal (MPC). One is associated with photonic band gap (PBG) relevant to Bragg scattering, while the other is associated with PBG originating from magnetic surface plasmon resonance. Both support robust unidirectional wave transmission, but each with relatively limited operating bandwidth. By optimizing the lattice spacing and filling ratio of MPC as well as tuning the external static biasing magnetic field, we are able to fuse the two types of EM one-way edge states together and therefore achieve broadband one-way transmission. The operating bandwidth could be about 4 GHz in a microwave regime; this is much larger than that based on either type, providing a way towards the practical applications of unidirectional wave propagation.

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“…Compositional Space. We have considered various combinations of alkaline-earth, rare-earth, lanthanide, and transition metal ions to computationally design a total of 159 DPOs, spanning over a wide range of charge states, coordination numbers, and tolerance factors (τ), 46 as shown in Figure 2. A list of the selected elements from different series is given in Table 1.…”

Section: ■ Introductionmentioning

confidence: 99%

Predictive Design of Hybrid Improper Ferroelectric Double Perovskite Oxides

Gayathri,

Ghosh,

Ghosh

2023

Chem. Mater.

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The computational design of suitable multiferroic double perovskite oxides requires finding materials that exhibit sizable polarization, magnetization, and coupling between them. Oxides with the chemical formula of AA′BB′O 6 with building blocks of ABO 3 single perovskite oxides in centrosymmetric Pnma symmetry are strong candidates that have been reported to satisfy such criteria. The system lowers to noncentrosymmetric, polar P2 1 symmetry if A/A′ layered and B/B′ rocksalt cation orderings are imposed. A detailed compositional search over a variety of chemical spaces followed by evaluating their polarization may lead to the identification of more of these compounds with ferroelectric ordering. The standard density functional theory practices to estimate polarization within the Berry phase formalism require the systems to be perfectly insulating. The number of compounds that can be evaluated using this method is therefore limited. In this work, we introduce a predictive learning strategy based on importance sampling to build a series of machine learning models using results from first-principles simulations to predict polarization and the corresponding switching barrier. The geometry-driven features related to charge states and cationic radii play key roles in predicting the switching barrier with complementary contributions from the key structural mode-based order parameters. These modes become important to draw reasonable predictions of polarization components from machine learning models. Our predictive models identify candidates with high polarizations and low switching barriers from a pool of double perovskite oxides, suitable for future investigation for their potential applications in spintronic devices.

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Magneto‐optical Materials

Cited by 6 publications

References 219 publications

Ultrasensitive transverse magneto-optical Kerr effect measurements using an effective ellipsometric detection scheme

Ultrasensitive transverse magneto-optical Kerr effect measurements using an effective ellipsometric detection scheme

Fusing electromagnetic one-way edge states to achieve broadband unidirectional wave transmission

Predictive Design of Hybrid Improper Ferroelectric Double Perovskite Oxides

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