Analysis of Magnetic Relaxation With Pre-Existing Nucleation Sites Based on the Fatuzzo–Labrune Model

Quach, Duy-Truong; Handoko, Djati; Lee, S.; Shim, Joongpyo; Phan, The‐Long; Kim, D.; Pham, Duc-Thang; Lee, K.; Jeong, Jong‐Ryul; Ngo, Duc‐The

doi:10.1109/tmag.2015.2443855

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…The dynamic properties of the magnetization of the thin film can be observed from the shape of the hysteresis curve, relaxation time and other magnetization parameters such as coercivity and magnetic saturation [3], [4]. With a simple system, MOKE can also be modified into MOKE microscopy to observe magnetic domains and the dynamic properties of magnetic nanomaterials [5]. In a MOKE-based measurement system, overcoming signal interference is one of the parameters that must be carried out, but until now there is still little research that discusses the interference that exists in the MOKE system.…”

Section: Introductionmentioning

confidence: 99%

Dynamics Noise Behaviors on Magneto-Optical Kerr Effect Measurement System

Handoko

Kim

2023

IPR

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Nowadays, computer and data processing industry are moving to nanomagnetic devices technology. One of the common measurement systems to observe nanomagnetic device are magneto optical Kerr effect and Faraday effects. The magneto-optical Kerr effect measurement system has been fabricated and precision noise measurement configuration was observed. A light intensity, which was reflected by thin film nanomagnetic surface, was measured accompany with its noise level. The lock-in amplifier was attached to pick up hysteresis signal and low noise level. Different frequency of lock-in amplifier was carried out to observe dynamics noise level behavior. Interestingly, we found butterfly shape noise corresponding to hysteresis loop shape. Furthermore, noise behavior with 0.94 scaling exponent, was found with respect to lock-in amplifier frequencies suggested that measuring in low frequency became more challenging.

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Section: Introductionmentioning

confidence: 99%

Dynamics Noise Behaviors on Magneto-Optical Kerr Effect Measurement System

Handoko

Kim

2023

IPR

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Perpendicular Magnetization Switching Driven by Spin‐Orbit Torque for Artificial Synapses in Epitaxial Pt‐Based Multilayers

Zhang

Zhao

et al. 2022

Adv Elect Materials

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Perpendicular magnetization switching driven by spin‐orbit torque (SOT) exhibits nonvolatility and adjustability, which has great potential applications in magnetic random‐access memory and neuromorphic computing. In this work, the SOT efficiency in the Pt (001)/NiFe (Py) and Pt (111)/Py bilayers is first investigated, where the single crystal Pt films and polycrystalline Py films are grown by molecular beam epitaxy and magnetron sputtering, respectively. The (001)‐oriented Pt sample shows a larger SOT efficiency than that of the (111)‐oriented one, which is mainly attributed to the facet‐dependent intrinsic spin Hall effect of the Pt layer related to the Berry curvature of the electrical band structure. Then, the epitaxial Pt (001)‐based perpendicularly magnetized multilayers are designed to study the perpendicular magnetization switching driven by SOT. A continuous and stable reversal is successfully achieved, providing a conceivable candidate for reliable and variable imitation of the artificial synapses. The magneto–optical Kerr effect imaging proves that the sustainable change of magnetization state originates from the multiple site domain nucleation and growth in the ferromagnetic layer. This work provides an efficient method to enhance the SOT efficiency, as well as employs the epitaxial thin films in artificial synaptic devices for neuromorphic computing.

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Analysis of Magnetic Relaxation With Pre-Existing Nucleation Sites Based on the Fatuzzo–Labrune Model

Cited by 2 publications

References 13 publications

Dynamics Noise Behaviors on Magneto-Optical Kerr Effect Measurement System

Dynamics Noise Behaviors on Magneto-Optical Kerr Effect Measurement System

Perpendicular Magnetization Switching Driven by Spin‐Orbit Torque for Artificial Synapses in Epitaxial Pt‐Based Multilayers

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