Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal (2024)

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  • Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal (2024)

    FAQs

    What is the ferromagnetic quantum anomalous hall effect? ›

    The two-dimensional Quantum Hall effect with no external magnetic field is called the Quantum anomalous Hall (QAH) effect. So far, experimentally realized QAH insulators all exhibit ferromagnetic order and the QAH effect only occurs at very low temperatures.

    What is the anomalous Hall effect in fe3sn2? ›

    In this work we show that Fe3Sn2 possesses an unusual anomalous Hall effect. The saturated Hall resistivity of Fe3Sn2 is 3.2 µΩ cm at 300 K, almost 20 times higher than that of typical itinerant ferromagnets such as Fe and Ni.

    What is the anomalous Hall effect in magnetization? ›

    When magnetic field is applied to a metal in which current is flowing, a transverse electrical current appears. This is the so-called classical Hall effect. In some magnetic materials a transverse current appears even in absence of external magnetic field, an effect known as the anomalous Hall effect (AHE)1.

    What is the anomalous Hall effect iron? ›

    The Anomalous Hall Effect (AHE) manifests as a transverse voltage proportional to magnetization in ferromagnetic materials under the application of a charge current, being an indispensable tool for probing magnetism, especially in nanoscale devices.

    What is the giant Hall effect? ›

    This giant Hall effect (GHE) is ascribed to the local quantum-interference effect induced reduction of the charge carriers. Transmission electron microscopy images and transport properties indicate that our films form two dimensional granular arrays. The GHE may provide useful and sensitive applications.

    What is Hall effect in ferromagnetic materials? ›

    In every case studied, the Hall emf consists of a sum of two terms. The first term is proportional to the magnetizing field and has been called the ordinary Hall effect. Its order of magnitude and sensitivity to variations in temperature and in composition are comparable with the Hall effect in nonferromagnetic metals.

    What is the equation for the anomalous Hall effect? ›

    As discussed in the introduction, the Hall resistivity of a ferromagnet is described by ρxy = RoB + Rs4πM, where the second term is the anomalous contribution to the Hall resistivity.

    What is the difference between normal and anomalous Hall effect? ›

    In ferromagnetic materials (and paramagnetic materials in a magnetic field), the Hall resistivity includes an additional contribution, known as the anomalous Hall effect (or the extraordinary Hall effect), which depends directly on the magnetization of the material, and is often much larger than the ordinary Hall ...

    What is the quantum anomalous Hall effect theory? ›

    The quantum anomalous Hall effect is defined as a quantized Hall effect real- ized in a system without an external magnetic field. The quantum anomalous Hall effect is a novel manifestation of topological structure in many-electron systems and may have potential applications in future electronic devices.

    What is the physics behind the Hall effect? ›

    The Hall effect is the deflection of electrons (holes) in an n-type (p-type) semiconductor with current flowing perpendicular to a magnetic field. The deflection of these charged carriers sets up a voltage, called the Hall voltage, whose polarity depends on the effective charge of the carrier.

    What is the Hall effect Cannot be used to find? ›

    The hall effect cannot be used to determine the magnetic field, which does not act perpendicular to the direction of the electric field.

    Can Hall effect be observed in metal? ›

    The Hall effect in metals is too small to have practical applications. Instead, the same effect in semiconductors is the standard for magnetic field sensing. Yet, in semiconducting Hall-sensors, Joule heating severely compromises the linearity range.

    What is the quantum Hall effect explained simply? ›

    The Quantum Hall effect is a phenomena exhibited by 2D materials, and can also be found in graphene [42]. When electrons in a 2D material at very low temperature are subjected to a magnetic field, they follow cyclotron orbits with a radius inversely proportional to the magnetic field intensity.

    What is the ferromagnetic effect? ›

    In ferromagnetism, the magnetic moments point in the same direction. Due to this, the magnetic susceptibility of a substance increases to a great extent. Ferromagnetism is observed in transition metals and some of their compounds. In antiferromagnetism, the magnetic moments point in the opposite direction.

    What is the fractal quantum Hall effect? ›

    This effect, termed the fractional quantum Hall effect (FQHE), represents an example of emergent behavior in which electron interactions give rise to collective excitations with properties fundamentally distinct from the fractal IQHE states.

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