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Asymmetric scattering behaviors of spin wave dependent on magnetic vortex chirality

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Chinese Physics B 2023年第10期32卷 635-640页

作者：张雪枫沈帝虎马晓萍宋成于海明朴红光 Hubei Engineering Research Center of Weak Magnetic-Field Detection China Three Gorges UniversityYichang 443002China Department of Physics College of ScienceYanbian UniversityYanji 133002China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Fert Beijing Institute School of Integrated Circuit Science and EngineeringBeijing Advanced Innovation Center for Big Data and Brain ComputingBeihang UniversityBeijing 100191China

We investigate asymmetric spin wave scattering behaviors caused by vortex chirality in a cross-shaped ferromagnetic system by using the micromagnetic *** the system,four scattering behaviors are found:(i)asymmetric skew scattering,depending on the polarity of vortex core,(ii)back scattering(reflection),depending on the vortex core stiffness,(iii)side deflection scattering,depending on structural symmetry of the vortex circulation,and(iv)geometrical scattering,depending on waveguide *** first and second scattering behaviors are attributed to nonlinear topological magnon spin Hall effect related to magnon spin-transfer torque effect,which has value for magnonic exploration and application.

关键词： magnonics magnetic vortex spin wave magnetic chirality

Raman spectroscopy studies of spin wave and spin flip in hexagonal manganites

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Raman spectroscopy studies of spin wave and spin flip in hex...

Discovery of strong bulk Dzyaloshinskii-Moriya interaction in composition-uniform centrosymmetric magnetic single layers

第十九届全国光散射学术会议

作者： Xiang-Bai Chen Peng-Cheng Guo Nguyen Thi Huyen Seung Kim In-Sang Yang Xueyun Wang Sang-Wook Cheong School of Science and Laboratory of Optical Information Technology Wuhan Institute of Technology Department of Physics and Division of Nano-Sciences Ewha Womans University Rutgers Center for Emergent Materials and Department of Physics and Astronomy Rutgers University

＜正＞Understanding of spin wave and spin flip is crucial for future developments of magnonic and spintronic *** this talk,we present systematic Raman spectroscopy studies of spin wave and spin flip in hexagonal manga... 详细信息

关键词： spin wave spin flip hexagonal manganites Raman spectroscopy

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 174-180页

作者： Lijun Zhu David Lujan Xiaoqin Li State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Department of Physics Center for Complex Quantum SystemsUniversity of Texas at AustinAustin 78712USA

Dzyaloshinskii-Moriya interaction(DMI)is the key ingredient of chiral spintronic phenomena and the emerging technologies based on such phenomena.A nonzero DMI usually occurs at magnetic interfaces or within non-centrosymmetric single ***,we report the observation of a strong unexpected DMI within a centrosymmetric polycrystalline ferromagnet that has neither a crystal inversion symmetry breaking nor a composition *** DMI is a bulk effect,increases with the thickness of the magnetic layer,and is insensitive to the symmetry of the interfaces or the neighboring *** observe a total DMI strength that is a factor of>2 greater than the highest interfacial DMI in the *** DMI most likely arises from the strong spin-orbit coupling,strong orbital hybrization,and a“hidden”long-range asymmetry in the *** discovery of the strong unconventional bulk DMI in centrosymmetric,composition-uniform magnetic single layers provides fundamental building blocks for the emerging field of spintronics and will stimulate the exploitation of unconventional spin-orbit phenomena in a wide range of materials.

关键词： Brillouin light scattering Dzyaloshinskii-Moriya interaction spin wave

spin waves and phase transition on a magnetically frustrated square lattice with long-range interactions

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Frontiers of physics 2023年第3期18卷 71-80页

作者：谭宇婷姚道新 State Key Laboratory of Optoelectronic Materials and Technologies Center for Neutron Science and TechnologyGuangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China

We investigate the effects of long-range interactions on the spin wave spectra and the competition between magnetic phases on a frustrated square lattice with large spin *** the spin wave theory and assisted with symmetry analysis,we obtain analytical expressions for spin wave spectra of competing Neel and(π,0)stripe states of systems containing anyorder long-range *** the specific case of long-range interactions with power-law decay,we find surprisingly that the staggered long-range interaction suppresses quantum fluctuation and enlarges the ordered moment,especially in the Neel state,and thus extends its phase boundary to the stripe *** findings illustrate the rich possibilities of the roles of long-range interactions,and advocate future investigations in other magnetic systems with different structures of interactions.

关键词： spin wave phase transition frustration square lattice long-range interaction antiferromagnet

Tunable dispersion relations manipulated by strain in skyrmion-based magnonic crystals

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Chinese Physics B 2024年第1期33卷 692-696页

作者：金兆年何宣霖于超方贺男陈琳陶志阔 Bell Honors School Nanjing University of Posts and TelecommunicationsNanjing 210003China College of Electronic and Optical Engineering&College of Flexible Electronics Nanjing University of Posts and TelecommunicationsNanjing 210003China

We theoretically investigate the propagation characteristics of spin waves in skyrmion-based magnonic crystals. It is found that the dispersion relation can be manipulated by strains through magneto-elastic coupling. Especially, the allowed bands and forbidden bands in dispersion relations shift to higher frequency with strain changing from compressive to tensile,while shifting to lower frequency with strain changing from tensile to compressive. We also confirm that the spin wave with specific frequency can pass the magnonic crystal or be blocked by tuning the strains. The result provides an advanced platform for studying the tunable skyrmion-based spin wave devices.

关键词： skyrmion magnonic crystal spin wave dispersion relation

spin waves in the block checkerboard antiferromagnetic phase

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Chinese Physics B 2012年第2期21卷 509-520页

作者：卢峰戴希 Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Motivated by the discovery of a new family of 122 iron-based superconductors, we present the theoretical results on the ground state phase diagram, spin wave, and dynamic structure factor obtained from the extended J1-J2 Heisenberg model. In the reasonable physical parameter region of K2Fe4Se5, we find that the block checkerboard antiferromagnetic order phase is stable. There are two acoustic spin wave branches and six optical spin wave branches in the block checker- board antiferromagnetic phase, which have analytic expressions at the high-symmetry points. To further compare the experimental data on neutron scattering, we investigate the saddlepoint structure of the magnetic excitation spectrum and the inelastic neutron scattering pattern based on linear spin wave theory.

关键词： spin wave phase diagram superconductivity

Voltage control of ferromagnetic resonance and spin waves

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Chinese Physics B 2018年第9期27卷 34-44页

作者：赵星儿胡忠强杨曲彭斌周子尧刘明 Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric ResearchSchool of Electronic and Information Engineering Xi'an Jiaotong University

The voltage control of magnetism has attracted intensive attention owing to the abundant physical phenomena associated with magnetoelectric coupling. More importantly, the techniques to electrically manipulate spin dynamics, such as magnetic anisotropy and ferromagnetic resonance, are of great significance because of their potential applications in high-density memory devices, microwave signal processors, and magnetic sensors. Recently, voltage control of spin waves has also been demonstrated in several multiferroic heterostructures. This development provides new platforms for energyefficient, tunable magnonic devices. In this review, we focus on the most recent advances in voltage control of ferromagnetic resonance and spin waves in magnetoelectric materials and discuss the physical mechanisms and prospects for practical device applications.

关键词： voltage control ferromagnetic resonance spin wave magnetoelectric coupling

Field-dependent spin waves in high-aspect-ratio singlecrystal ferromagnetic nanowires

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Nano Research 2016年第5期9卷 1426-1433页

作者： Semanti Pal Susmita Saha M. Venkata Kamalakar Anjan Barman Department of Condensed Matter Physics and Material Sciences S. N. Bose National Centre for Basic Sciences Block JD Sector Ⅲ Salt Lake Kolkata 700 098 India Department of Physics and Astronomy Uppsala University Box 516 75120 Uppsala Sweden

We investigate the spin wave （SW） modes in high-aspect-ratio single-crystal ferromagnetic nanowires （FMNWs） using an all-optical time-resolved magnetooptical Kerr effect （TR-MOKE） microscope. The precessional magnetization dynamics in such FMNWs unveil the presence of uniform and quantized SW modes that can be tuned by varying the bias magnetic field （H）. The frequencies of the modes are observed to decrease systematically with a decreasing magnetic field, and the number of modes in the spectrum is reduced from four to three for H 〈 0.7 kOe. To understand these results, we perform micromagnetic simulations that reveal the presence of edge, standing wave, and uniform SW modes in the nanowires （NWs）. Our simulations clearly show how the standing wave and uniform SW modes coalesce to form a single mode with uniform precession over the entire NW for H 〈 0.7 kOe, reproducing the experimentally observed reduction in modes. Our study elucidates the possibility of manipulating the SW modes in magnetic nanostructures, which is useful for applications in magnonic and spintronic devices.

关键词： spin wave Bias Field Ferromagnetic Resonance Magnetization Dynamic Uniform Mode

Magnetically tunable Airy-like beam of magnetostatic surface spin waves

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Chinese Optics Letters 2021年第1期19卷 90-94页

作者：戴海涛司马泰肖爱香薛永祥郭子扬张钰张晓东刘昌龙 Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300072China

In this Letter,we report an Airy-like beam of magnetostatic surface spin wave(Ai BMSSW)supported on the ferromagnetic film,which is transferred from the optical *** propagation properties of Ai BMSSW were verified with micromagnetic *** simulation results,the typical parabolic trajectory of the Airy-type beam was observed with an exciting source encoding 3/2 phase *** simulation results coincide well with design ***,simulated results showed that the trajectories of the Ai BMSSW could be tuned readily with varied external magnetic *** work can extend the application scenario of spin waves.

关键词： Airy-like beam spin wave magnetostatic surface spin wave 3/2 phase pattern