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Manipulation of Magnetic Topological Structures Using Localized Magnetic Field
Sooseok Lee,Hee-Sung Han,Dae-Han Jung,Myeonghwan Kang,Hye-Jin Ok,Namkyu Kim,Ki-Suk Lee 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Magnetic skyrmions are topologically stable swirling spin configuration and they hold promise as information carriers in future spintronic devices due to their impressive stability. For magnetic skyrmions to be practical, establishing controlling method in a selected area of the magnetic thin film is an essential prerequisite. In this presentation, we show experimental demonstration of skyrmion creation and annihilation in a Pt/Co/Ta multi-layered film with perpendicular magnetic anisotropy (PMA) by using highly localized magnetic field. To apply the local magnetic field, we utilized magnetized tip of the magnetic force microscopy (MFM) which generates highly localized stray field (Htip). As the tip-sample distance decreases, Htip becomes stronger and it reaches to the switching field of the PMA film, and the local magnetization direction of the films can be switched, and it induces creation of magnetic topological structures such as the magnetic skyrmions. Moreover, we demonstrate that the skyrmion polarization can be selectively reversed by changing the tip magnetization as well as they can remain stably without an external magnetic field. Our findings can provide a useful manipulation method for skyrmion based spintronic devices.
Manipulation of Magnetic Skyrmion by Localized Magnetic Field
Sooseok Lee,Hee-Sung Han,Dae-Han Jung,Myeonghwan Kang,Hye-Jin Ok,Namkyu Kim,Ki-Suk Lee 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The magnetic skyrmions are particle-like swirling magnetic configurations characterized by topological numbers. They have been attracted much attention due to highly promising information carriers in spintronic device applications. [1-5] For practical applications, such information carriers must be written and deleted in a specific area of the magnetic thin film. In this presentation, we report experimental demonstrations of creating and removing skyrmions through a local magnetic field in the Pt/Co/Ta multi-layered film with perpendicular magnetic anisotropy (PMA). We utilized a highly localized stray field (H<sub>tip</sub>) induced by magnetized tip of the magnetic force microscopy (MFM) for applying a local magnetic field [6]. As the tip–sample distance is decreases, H<sub>tip</sub> becomes stronger and it reaches to the switching field of the PMA film, and the magnetization direction of the films can be switched locally and it induces creation of the magnetic skyrmions. Depending on the tip magnetization, the skyrmion polarization can be selectively reversed, as well as they can remain stably without an external magnetic field [7]. Furthermore, we demonstrated manipulation of a single skyrmion in confined geometry. We also investigated the stability of the magnetic skyrmions and compared it with that of the stripe domains. Our findings can provide a useful manipulation method for skyrmion based spintronic devices.
Writing and Deleting Magnetic Bubbles using Local Magnetic Fields
Sooseok Lee,Hee-Sung Han,Dae-Han Jung,Namkyu Kim,Myeonghwan Kang,Hye-Jin Ok,Ki-Suk Lee 한국자기학회 2020 Journal of Magnetics Vol.25 No.4
Magnetic bubbles are circular magnetic domains that may occur in thin magnetic films with perpendicular magnetic anisotropy (PMA). Because they can form with high topological stability and can be manipulated by external driving forces, magnetic bubbles have been considered as prominent information carriers, which are set to 1 or 0, corresponding to the presence or absence. For practical applications, such information carriers must be written and deleted in a specific area of the magnetic thin film. Herein, we report that the magnetic bubbles can be written and deleted using local magnetic fields. By applying a localized magnetic field from the magnetic tip of a magnetic force microscopy to the stripe domain structures of the PMA multilayer, bubbles can be written at room temperature via the transformation from stripe domains to magnetic bubbles. The deleting of the bubbles in the targeted area demonstrated by the local magnetic field accompanied by a uniform external field. Our findings can provide a key for manipulating information carriers in the spintronic device based on topological magnetic structures such as magnetic skyrmions and bubbles.