Single shot all-optical switching of the magnetization by femtosecond laser pulses in rare-earth transition-metal ferrimagnetic materials is particularly promising for future ultrafast magnetic storage applications.Mo...Single shot all-optical switching of the magnetization by femtosecond laser pulses in rare-earth transition-metal ferrimagnetic materials is particularly promising for future ultrafast magnetic storage applications.Moreover,ultrafast lasergenerated spin currents appear to play an important role in the switching process.Here,we try to separately detect the spin current from Gd in a Co/Gd bilayer system using terahertz time-domain spectroscopy.To this aim,we use different capping,buffer and embedded layers in order to tune the spin-to-charge and spin-current propagation and identify currents from each of the layers.We attribute the observed THz emission in all layers to the transition metal demagnetization induced spin currents,and detect no contribution from the Gd demagnetization.We attribute this absence of Gd-induced THz signal to the potentially slow demagnetization of Gd,which shift the emission spectra to lower frequencies,below our detection capabilities.These results highlight the limitations in using materials suffering from the so-called critical slowdown for the optimization of spintronic THz emitters.展开更多
第五届中国国际集成电路博览会暨高峰论坛（IC China 2007）能够在深圳首次召开，是深圳集成电路业界欢欣鼓舞的一件大事，深圳是一个充满朝气和活力的城市，在珠三角地区电子整机产业的带动下，深圳集成电路产业得到了快速发展，并形...第五届中国国际集成电路博览会暨高峰论坛（IC China 2007）能够在深圳首次召开，是深圳集成电路业界欢欣鼓舞的一件大事，深圳是一个充满朝气和活力的城市，在珠三角地区电子整机产业的带动下，深圳集成电路产业得到了快速发展，并形成了以设计为主体，包括芯片制造、封装、测试、半导体设备与材料、产品应用在内的完整产业链和良好的产业生态环境。展开更多
Transition-metal oxides have attracted much attention due to its abundant crystalline phases and intriguing physical properties. However, some of these compounds are difficult to be fabricated directly in film form du...Transition-metal oxides have attracted much attention due to its abundant crystalline phases and intriguing physical properties. However, some of these compounds are difficult to be fabricated directly in film form due to the ease of valence variation of transition-metal elements.In this work, we reveal the reversible structural transition between SrVO3 and Sr2V2O7 films via thermal treatment in oxygen atmosphere or in vacuum. Based on this, Sr2V2O7 epitaxial films are successfully synthesized and studied. Property characterizations show that the semitransparent and metallic SrVO3 could reversibly switch into transparent and insulating Sr2V2O7, implying potential applications in controllable electronic and optical devices.展开更多
Using in situ electric-field-modulated anisotropic magnetoresistance measurement, a large reversible and non- volatile in-plane rotation of magnetic easy axis of -35° between the positive and negative electrical ...Using in situ electric-field-modulated anisotropic magnetoresistance measurement, a large reversible and non- volatile in-plane rotation of magnetic easy axis of -35° between the positive and negative electrical poling states is demonstrated in C040Fe40B20//（001）-cut Pb（Mgl/3Nb2/3）O3-25PbTiO3 （PMN-PT）. The specific magneto- electric coupling mechanism therein is experimentally verified to be related to the synchronous in-plane strain rotation induced by 109° ferroelastic domain switching in the （001）-cut PMN-PT substrate.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2023YFF0719200)the National Natural Science Foundation of China(Grant No.62105011)+3 种基金the French National Research Agency ANR through the UFO project(Grant No.ANR-20-CE090013)the SLAM project(Grant No.ANR-23-CE30-0047)the MAT-PULSE-Lorraine Universitéd’Excellence project(Grant No.ANR-15-IDEX-04-LUE)the France 2030 Government Grants PEPR Electronic EMCOM(Grant No.ANR-22-PEEL-0009)。
文摘Single shot all-optical switching of the magnetization by femtosecond laser pulses in rare-earth transition-metal ferrimagnetic materials is particularly promising for future ultrafast magnetic storage applications.Moreover,ultrafast lasergenerated spin currents appear to play an important role in the switching process.Here,we try to separately detect the spin current from Gd in a Co/Gd bilayer system using terahertz time-domain spectroscopy.To this aim,we use different capping,buffer and embedded layers in order to tune the spin-to-charge and spin-current propagation and identify currents from each of the layers.We attribute the observed THz emission in all layers to the transition metal demagnetization induced spin currents,and detect no contribution from the Gd demagnetization.We attribute this absence of Gd-induced THz signal to the potentially slow demagnetization of Gd,which shift the emission spectra to lower frequencies,below our detection capabilities.These results highlight the limitations in using materials suffering from the so-called critical slowdown for the optimization of spintronic THz emitters.
文摘第五届中国国际集成电路博览会暨高峰论坛（IC China 2007）能够在深圳首次召开，是深圳集成电路业界欢欣鼓舞的一件大事，深圳是一个充满朝气和活力的城市，在珠三角地区电子整机产业的带动下，深圳集成电路产业得到了快速发展，并形成了以设计为主体，包括芯片制造、封装、测试、半导体设备与材料、产品应用在内的完整产业链和良好的产业生态环境。
基金supported by the National Key R&D Program of China(No.2016YFA0300102)the National Natural Science Foundation of China(No.11675179,No.11434009,and No.11374010)+2 种基金the Fundamental Research Funds for the Central Universities(No.WK2340000065)partially carried out at the University of Science and Technology of China(USTC)center for Micro and Nanoscale Research and Fabricationthe support from the magnetic circular dichroism endstation at Hefei Light Source
文摘Transition-metal oxides have attracted much attention due to its abundant crystalline phases and intriguing physical properties. However, some of these compounds are difficult to be fabricated directly in film form due to the ease of valence variation of transition-metal elements.In this work, we reveal the reversible structural transition between SrVO3 and Sr2V2O7 films via thermal treatment in oxygen atmosphere or in vacuum. Based on this, Sr2V2O7 epitaxial films are successfully synthesized and studied. Property characterizations show that the semitransparent and metallic SrVO3 could reversibly switch into transparent and insulating Sr2V2O7, implying potential applications in controllable electronic and optical devices.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11374010 and 11434009the Fundamental Research Funds for the Central Universities
文摘Using in situ electric-field-modulated anisotropic magnetoresistance measurement, a large reversible and non- volatile in-plane rotation of magnetic easy axis of -35° between the positive and negative electrical poling states is demonstrated in C040Fe40B20//（001）-cut Pb（Mgl/3Nb2/3）O3-25PbTiO3 （PMN-PT）. The specific magneto- electric coupling mechanism therein is experimentally verified to be related to the synchronous in-plane strain rotation induced by 109° ferroelastic domain switching in the （001）-cut PMN-PT substrate.
