Enhanced anomalous Nernst effects in ferromagnetic materials driven by Weyl nodes

AbstractOver the past years, the development of organic ferromagnetic materials has been investigated worldwide for potential applications. Due to the couplings among the charge, orbit, spin, and phonon in organic ferromagnetic materials, magnetoelectric, and optomagnetic couplings have been realized and observed. In this review, progress in organic magnetoelectric and optomagnetic couplings is presented, and the mechanisms behind the phenomena are also briefly summarized. Hopefully, the understanding of magnetoelectric and optomagnetic couplings could provide guidance for the further development of organic spin optoelectronics.

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Ferromagnetic Materials: Gigantic Current Control of Coercive Field and Magnetic Memory Based on Nanometer‐Thin Ferromagnetic van der Waals Fe 3 GeTe 2 (Adv. Mater. 4/2021)

Advanced Materials ◽

10.1002/adma.202170029 ◽

2021 ◽

Vol 33 (4) ◽

pp. 2170029

Author(s):

Kaixuan Zhang ◽

Seungyun Han ◽

Youjin Lee ◽

Matthew J. Coak ◽

Junghyun Kim ◽

...

Keyword(s):

Coercive Field ◽

Van Der Waals ◽

Ferromagnetic Materials ◽

Current Control ◽

Magnetic Memory

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Study on the Structure and Composition of new Ferromagnetic Materials with an Automated System for Complex Non-destructive Testing

2020 XXX International Scientific Symposium 'Metrology and Metrology Assurance (MMA) ◽

10.1109/mma49863.2020.9254265 ◽

2020 ◽

Author(s):

Bozhidar Dzhudzhev ◽

Boris Velev ◽

Martin Zlatkov ◽

Petko Kostadinov

Keyword(s):

Ferromagnetic Materials ◽

Automated System ◽

Non Destructive Testing ◽

Destructive Testing ◽

Non Destructive

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Examining Ferromagnetic Materials Subjected to a Static Stress Load Using the Magnetic Method

Materials ◽

10.3390/ma14133455 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3455

Author(s):

Tomasz Chady ◽

Ryszard Łukaszuk

Keyword(s):

Statistical Analysis ◽

Measurement System ◽

Rolling Direction ◽

Hysteresis Loops ◽

Ferromagnetic Materials ◽

Static Stress ◽

Magnetic Method ◽

Experimental Examination ◽

Stress Load ◽

Anisotropic Steel

This paper discusses the experimental examination of anisotropic steel-made samples subjected to a static stress load. A nondestructive testing (NDT) measurement system with a transducer, which enables observation of local hysteresis loops and detection of samples’ inhomogeneity, is proposed. Local hysteresis loops are measured on two perpendicular axes, including one parallel to the rolling direction of the samples. The results confirm that the selected features of the local hysteresis loops provide important information about the conditions of ferromagnetic materials. Furthermore, it is shown that the selected parameters of the statistical analysis of the achieved measurements are beneficial for evaluating stress and fatigue changes induced in the material.

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Ultrafast optical manipulation of magnetic order in ferromagnetic materials

Nano Convergence ◽

10.1186/s40580-020-00246-3 ◽

2020 ◽

Vol 7 (1) ◽

Author(s):

Chuangtang Wang ◽

Yongmin Liu

Keyword(s):

Data Storage ◽

Optical Switching ◽

Ultrafast Lasers ◽

Transport Model ◽

Magnetic Interaction ◽

Ferromagnetic Materials ◽

Magnetic Storage ◽

Magnetization Dynamics ◽

Quarter Century ◽

Ultrafast Optical

Abstract The interaction between ultrafast lasers and magnetic materials is an appealing topic. It not only involves interesting fundamental questions that remain inconclusive and hence need further investigation, but also has the potential to revolutionize data storage technologies because such an opto-magnetic interaction provides an ultrafast and energy-efficient means to control magnetization. Fruitful progress has been made in this area over the past quarter century. In this paper, we review the state-of-the-art experimental and theoretical studies on magnetization dynamics and switching in ferromagnetic materials that are induced by ultrafast lasers. We start by describing the physical mechanisms of ultrafast demagnetization based on different experimental observations and theoretical methods. Both the spin-flip scattering theory and the superdiffusive spin transport model will be discussed in detail. Then, we will discuss laser-induced torques and resultant magnetization dynamics in ferromagnetic materials. Recent developments of all-optical switching (AOS) of ferromagnetic materials towards ultrafast magnetic storage and memory will also be reviewed, followed by the perspectives on the challenges and future directions in this emerging area.

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