Preparation of the superconducting magnetostatic wave device by the heterostructure of the oxide superconductor/ferromagnet.

氧化物超导/铁磁体异质结构制备超导静磁波器件

• 批准号: 14550017
• 负责人: HONTSU Shigeki
• 金额: $ 1.47万
• 依托单位: Kinki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550017/
• 关键词: superconducting electronics; superconducting microwave device; magnetostatic wave; superconducting vortices; 超伝導; ヘテロ構造; 酸化物超伝導体; 強磁性体; YIG; superconducting electronics; superconducting microwave device; magnetostatic wave; superconducting vortices; 超伝導; ヘテロ構造; 酸化物超伝導体; 強磁性体; YIG

On the electronic application of the superconductor, SQUID or SFQ circuit have utilized the feature of the flux quantumization, up-to-maximum. However, only the low surface resistance is noted for the field of superconducting microwave device. Thus, we have noted the application of the flux quantum to the microwave devices. In this idea, we have investigated and fabricated the prototype device of the superconducting magnetostatic wave device, in which the superconducting vortices and the magnetostatic wave propagating in the ferromagnetic matter. The effects of the interaction between the vortices and the magnetostatic wave are following two points. One is the magnetic energy of the magnetostatic wave will be absorbed by the vortices. The other is the switch of the superconductor to the normal state because of the vortices motion driven by the magnetostatic wave. In order to verify the consideration, we have performed two experiments, i.e., the measurement of the magnetostatic wave pro … More pagation for the situation of vortices in the superconductor, and the I-V measurement of the superconductor for the situation of the magnetostatic wave propagation.In those measurement, we have monitored the switching behavior of the superconducting state and normal state by the propagation of the magnetostatic wave. Furthermore, the magnetostatic wave is certainly absorbed when the superconductor is the normal state. This is the first step of the novel superconducting microwave device which is the switching device controlled by the interaction between vortices and the magnetostatic wave device.The superconducting magnetostatic wave device is suitable by the fabrication as the bilayered epitaxial thin films of the superconductor and the ferromagnet. In the present stage, Y-Fe garnet(YIG) ferrite is widely used as the magnetostatic wave propagator. However, the YIG cannot be grown on the perovskite type superconductor. Thus, our motivation is toward to the search of the new magnetic material for the waveguide of the magnetostatic wave which can construct the heteroepitaxial bilayer with the superconductor. The material we have noted is perovskite type manganite Pr_<0.85>Ca_<0.15>MnO_3 (PCMO).As the first step, we have prepared the PCMO thin film. The X-ray diffraction shows the high quality epitaxial thin films on the Nb-SrTiO_3(100). In the next, the electric properties are evaluated with the temperaturerange of 25 K〜300K. As the results, the LN_2 temperature of 77K, the PCMO has suitable Δ_r and low loss tangent. This means the PCMO is useful for the microwave application. Furthermore, the PCMO/YBCO heterostructure is formed as the band elimination filter of the superconducting magnetostatic wave device. In this experiment, microwave in the superconducting straight line can excited the magnetostatic wave in the PCMO thin films. Less

在超导体的电子应用中，鱿鱼或SFQ电路已采用了最高量最大的通量量化功能。但是，对于超导微波装置的场，仅注意到低表面电阻。这就是我们注意到通量量子在微波设备上的应用。在这个想法中，我们已经研究并制造了超导磁波装置的原型装置，其中超导涡流和铁磁性物质中传播的磁静力波。涡流与磁性波之间的相互作用的影响遵循两个点。一个是磁波的磁能被涡流吸收。另一个是由于磁波驱动的涡流运动，超导体向正常状态的开关。为了验证考虑因素，我们进行了两个实验，即，磁性波Pro的测量…更多地打电话给超导体中涡流的状况，以及对磁性波传播的状况的I-V测量值的I-V测量值。在这些测量值中，我们通过磁性测量值进行了磁性的磁力，并通过磁性的行为进行了高度和正常的行为。此外，当超导体是正常状态时，磁波肯定会吸收。这是新型超导体微波设备的第一步，该设备是由涡流和磁静态波器件之间相互作用控制的开关装置。超导磁静力波器件适用于制造，因为双层超导剂的双层外延薄膜和超导体的双层均匀薄膜。在目前的阶段，Y-FE石榴石（YIG）铁氧体被广泛用作磁静态波传播器。但是，YIG不能在钙钛矿型超导体上生长。这是我们的动机是搜索磁静态波的波导的新磁性材料，这是一种高度准确的方法，它可以用超导体构建异性双层双层。我们注意到的材料是钙钛矿类型锰米pr_ <0.85> ca__ <0.15> mno_3（pCMO）。作为第一步，我们已经准备了PCMO薄膜。 X射线衍射显示了NB-SRTIO_3（100）上的高质量外延薄膜。接下来，用25 K至300K的温度评估电特性。结果，LN_2温度为77K，PCMO具有合适的Δ_R和低损耗切线。这意味着PCMO对于微波应用程序很有用。此外，PCMO/YBCO异质结构是作为超导磁波装置的带消除滤波器形成的。在该实验中，超导直线中的微波炉可以激发PCMO薄膜中的磁性波。较少的