Cryogenic Magnetic Field Sensors and Magnetic Field-Controlled Supercurrent Switches Based on Ferromagnetic/Superconducting/Ferromagnetic Trilayers: the Performance of NiFe/Nb/NiFe and Co/Nb/Co

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• 作者：E. Aristomenopoulou ; D. Stamopoulos
• 关键词：Ferromagnetic/superconducting/ferromagnetic trilayers ; Cryogenic magnetic field sensors ; Cryogenic magnetic field ; controlled supercurrent switches ; NiFe/Nb/NiFe ; Co/Nb/Co
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：28
• 期：8
• 页码：2321-2329
• 全文大小：936 KB
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• 作者单位：E. Aristomenopoulou (1)
  D. Stamopoulos (1) (2)
  
  1. Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos- Aghia Paraskevi, 153 10, Athens, Greece
  2. Department of Solid State Physics, National and Kapodistrian University of Athens, Zografou Panepistimioupolis, 157 84, Zografou, Greece
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

In the last decades, many superconductor-based devices have been utilized in practical applications that refer to the production/sensing of ultra-high/low magnetic fields, resistive storage of data, etc. The superconducting magnetoresistance effect (sMRE) observed in ferromagnetic/superconducting/ferromagnetic trilayers (TLs) has been widely studied in the literature. Here, we investigate Ni80Fe20/Nb/Ni80Fe20 and Co/Nb/Co TLs on a comparative basis and we provide technical guidelines that empower us to design magnetic field sensors and magnetic field-controlled supercurrent switches for cryogenic applications. The performance of these TLs has been studied in great detail. It turned out that Ni80Fe20-based TLs are applicable in the regime of low magnetic fields (on the order of a few hundred Oe) due to their magnetically soft character, while Co-based ones are effective at relatively higher magnetic fields (on the order of a few thousand Oe) owing to their magnetically harder behavior. The Ni80Fe20-based TLs exhibit a sMRE magnitude, (Rmax ?Rmin)/ Rnor ×100 %, on the order of 30-0 % and a field sensitivity, d R(H)/dH, on the order of 4.0-.0 mOhm/Oe. The Co-based TLs have higher sMRE magnitude on the order of 30-00 %; however, they exhibit lower field sensitivity on the order of 0.3-.6 mOhm/Oe. Finally, the Co-based TLs exhibit an abnormal behavior of the upper critical field line, Hc2(T), at low magnetic fields. This feature is absent in the Ni80Fe20-based TLs. Due to the differences outlined above, the Ni80Fe20-based and Co-based TLs can be possibly utilized in two distinct categories of devices, namely magnetic field sensors and magnetic field-controlled supercurrent switches, respectively.