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Influence of exchange bias on spin torque ferromagnetic resonance for quantification of spin–orbit torque efficiency
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作者 赵乾 张腾飞 +6 位作者 何斌 李子木 张森富 于国强 王建波 刘青芳 魏晋武 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第5期688-694,共7页
Antiferromagnet(AFM)/ferromagnet(FM)heterostructure is a popular system for studying the spin–orbit torque(SOT)of AFMs.However,the interfacial exchange bias field induces that the magnetization in FM layer is noncoll... Antiferromagnet(AFM)/ferromagnet(FM)heterostructure is a popular system for studying the spin–orbit torque(SOT)of AFMs.However,the interfacial exchange bias field induces that the magnetization in FM layer is noncollinear to the external magnetic field,namely the magnetic moment drag effect,which further influences the characteristic of SOT efficiency.In this work,we study the SOT efficiencies of IrMn/NiFe bilayers with strong interfacial exchange bias by using spin-torque ferromagnetic resonance(ST-FMR)method.A full analysis on the AFM/FM systems with exchange bias is performed,and the angular dependence of magnetization on external magnetic field is determined through the minimum rule of free energy.The ST-FMR results can be well fitted by this model.We obtained the relative accurate SOT efficiencyξ_(DL)=0.058 for the IrMn film.This work provides a useful method to analyze the angular dependence of ST-FMR results and facilitates the accurate measurement of SOT efficiency for the AFM/FM heterostructures with strong exchange bias. 展开更多
关键词 ANTIFERROMAGNETS spin-orbit torque exchange bias spin torque ferromagnetic resonance
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新饲料—银合欢
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作者 张森富 《中国农垦》 北大核心 1990年第1期31-31,共1页
银合欢是一种优良热带豆科木本饲料作物,其嫩茎叶营养丰富,蛋白质含量高,但有含羞草毒素,如畜禽利用不当,会引起中毒,因此长期未被用作饲料。1984年起华南热作研究院热作所,承担农业部畜牧局下达“银合欢栽培利用研究”课题,经过四年的... 银合欢是一种优良热带豆科木本饲料作物,其嫩茎叶营养丰富,蛋白质含量高,但有含羞草毒素,如畜禽利用不当,会引起中毒,因此长期未被用作饲料。1984年起华南热作研究院热作所,承担农业部畜牧局下达“银合欢栽培利用研究”课题,经过四年的努力,获得可喜成果。他们从银合欢引种、驯化、高产栽培和综合利用等方面系统进行试验研究。从九个属72多个品种中筛出有经济价值,可作为饲料的银合欢品种。经同行专家鉴定,该项成果达到国内先进水平,并在热带。 展开更多
关键词 银合欢 饲料作物 蛋白质含量 综合利用 高产栽培 含羞草 试验研究 经济价值 利用研究 亚热带
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农垦科技成果喜人
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作者 张森富 《中国农垦》 北大核心 1989年第10期9-9,共1页
党的十一届三中全会后,全国农垦系统认真贯彻执行国务院、部、委的有关奖励条例,积极开展科学技术进步活动,自1978年以来,获全国科学大会荣誉奖15项,发明奖3项,国家级科技进步奖14项、国家科委和国家农委农业科技推广奖30项,原农垦部重... 党的十一届三中全会后,全国农垦系统认真贯彻执行国务院、部、委的有关奖励条例,积极开展科学技术进步活动,自1978年以来,获全国科学大会荣誉奖15项,发明奖3项,国家级科技进步奖14项、国家科委和国家农委农业科技推广奖30项,原农垦部重大科技成果奖121项、农牧渔业部技术改进奖33项,农牧渔业部级科技进步奖76项、农牧渔业“丰收奖”13项。 展开更多
关键词 农垦 科技成果
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Angle-dependent spin wave spectra of permalloy ring arrays 被引量:1
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作者 Shuxuan Wu Zengtai Zhu +4 位作者 Yunxu Ma Jinwu Wei Senfu Zhang Jianbo Wang Qingfang Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第11期149-154,共6页
We investigated the angle-dependent spin wave spectra of permalloy ring arrays with the fixed outer diameter and various inner diameters by ferromagnetic resonance spectroscopy and micromagnetic simulation.When the fi... We investigated the angle-dependent spin wave spectra of permalloy ring arrays with the fixed outer diameter and various inner diameters by ferromagnetic resonance spectroscopy and micromagnetic simulation.When the field is obliquely applied to the ring,local resonance mode can be observed in different parts of the rings.And the resonance mode will change to perpendicular spin standing waves if the magnetic field is applied along the perpendicular direction.The simulation results demonstrated this evolution and implied more resonance modes that maybe exist.And the mathematical fitting results based on the Kittel equation further proved the existence of local resonance mode. 展开更多
关键词 spin waves magnetic resonance spectra spintronic devices
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Spin transfer nano-oscillator based on synthetic antiferromagnetic skyrmion pair assisted by perpendicular fixed magnetic field
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作者 Yun-Xu Ma Jia-Ning Wang +7 位作者 Zhao-Zhuo Zeng Ying-Yue Yuan Jin-Xia Yang Hui-Bo Liu Sen-Fu Zhang Jian-Bo Wang Chen-Dong Jin Qing-Fang Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第10期319-325,共7页
As a microwave generator, spin transfer nano-oscillator(STNO) based on skyrmion promises to become one of the next-generation spintronic devices. However, there still exist a few limitations to the practical applicati... As a microwave generator, spin transfer nano-oscillator(STNO) based on skyrmion promises to become one of the next-generation spintronic devices. However, there still exist a few limitations to the practical applications. In this paper, we propose a new STNO based on synthetic antiferromagnetic(SAF) skyrmion pair assisted by a perpendicular fixed magnetic field. It is found that the oscillation frequency of this kind of STNO can reach up to 5.0 GHz, and the multiple oscillation peak with higher frequency can be realized under a fixed out-of-plane magnetic field. Further investigation shows that the skyrmion stability is improved by bilayer antiferromagnetic coupling, which guarantees the stability process of skyrmion under higher spin-polarized current density. Our results provide the alternative possibilities for designing new skyrmionbased STNO to further improve the oscillation frequency, and realize the output of multiple frequency microwave signal. 展开更多
关键词 nano-oscillator SKYRMION spin-polarized current spintronic devices
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Experimental observation of interlayer perpendicular standing spin wave mode with low damping in skyrmion-hosting[Pt/Co/Ta]_(10)multilayer
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作者 Zhen-Dong Chen Mei-Yang Ma +6 位作者 Sen-Fu Zhang Mang-Yuan Ma Zi-Zhao Pan Xi-Xiang Zhang Xue-Zhong Ruan Yong-Bing Xu Fu-Sheng Ma 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第11期548-554,共7页
An interlayer perpendicular standing spin wave mode is observed in the skyrmion-hosting[Pt/Co/Ta]_(10) multilayer by measuring the time-resolved magneto-optical Kerr effect.The observed interlayer mode depends on the ... An interlayer perpendicular standing spin wave mode is observed in the skyrmion-hosting[Pt/Co/Ta]_(10) multilayer by measuring the time-resolved magneto-optical Kerr effect.The observed interlayer mode depends on the interlayer spin-pumping and spin transfer torque among the neighboring Co layers.This mode shows monotonically increasing frequency-field dependence which is similar to the ferromagnetic resonance mode,but within higher frequency range.Besides,the damping of the interlayer mode is found to be a relatively low constant value of 0.027 which is independent of the external field.This work expounds the potential application of the[heavy-metal/ferromagnetic-metal]_(n) multilayers to skyrmion-based magnonic devices which can provide multiple magnon modes,relatively low damping,and skyrmion states,simultaneously. 展开更多
关键词 dynamic properties of magnetization spin waves domain structure magnetic properties of interfaces
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