亞洲知識產權資訊網為知識產權業界提供一個一站式網上交易平台,協助業界發掘知識產權貿易商機,並與環球知識產權業界建立聯繫。無論你是知識產權擁有者正在出售您的知識產權,或是製造商需要購買技術以提高操作效能,又或是知識產權配套服務供應商,你將會從本網站發掘到有用的知識產權貿易資訊。

Manipulating relaxation rates in magnetic materials at gigahertz frequencies

總結
Lead Inventors: William E. Bailey, Ph.D.Problem or Unmet Need:Magnetic devices such as sensors, magnetic tunneling junctions and spin valves are headed toward nanoscale miniaturization. They are also frequently used at gigahertz (GHz) operating frequencies. Under these conditions it is predicted that the critical signal-to-noise ratio is inversely proportional to the damping constant at the GHz frequencies. Although prior work has shown that damping constants can be changed by introduction of rare-earth impurity atoms, such manipulations have only resulted in an increase in the damping constants. This technology provides the materials and methods to reduce damping constants in thin films in a wide range of devices and components. This invention details the method by which a thin film of magnetic material (e.g., iron) is alloyed with titanium (Ti), vanadium (V), chromium (Cr), and manganese (Mn) (i.e., lower Z transition metal elements than iron) is to reduce the relaxation rate of the ferromagnetic thin film. Alternatively, any other suitable element from group V or VI can be chosen. When vanadium is chosen, an alloy with the composition of Fe1-xVx, preferably with 'x' between 0 and 0.33, is formed. Such a thin film has been observed to reduce the damping constant significantly. The choice of the alloying element is arrived at by observing if there is a reduction in the gyromagnetic ratio (g) in iron with the introduction of the element through estimations from Einstein-de-Haas measurements. It should be noted that the method can be applied to metals other than iron (e.g., nickel, cobalt) as well as alloys (e.g., Permalloy).
技術優勢
Increased frequency ranges for devices using thin films Easy process integration (room temperature deposition) of these thin films can replace monolithic ferrite elements glued to chips in communications industry Device integration will lead to reduced fabrication cost and increased reliability
技術應用
Magnetic memory (MRAM) Spin electronics ('spintronics') Giant magnetoresistive and tunnel magnetoresistive sensors On-chip gigahertz elements (e.g., circulators and filters) in telecommunication and cellular devices Magnetic read heads Improved radio frequency identification (RFID) tags
詳細技術說明
This invention details the method by which a thin film of magnetic material (e.g., iron) is alloyed with titanium (Ti), vanadium (V), chromium (Cr), and manganese (Mn) (i.e., lower Z transition metal elements than iron) is to reduce the relaxat...
*Abstract
None
*Inquiry
Jim Aloise Columbia Technology Ventures Tel: (212) 854-8444 Email: TechTransfer@columbia.edu
*IR
M05-013
*Principal Investigation
*Publications
C. Scheck, L. Cheng, I. Barsukov, Z. Frait, and W. E. Bailey; "Low relaxation rate in epitaxial vanadium-doped ultrathin iron films." Phys. Rev. Lett. 98, 117601 (2007). (Editors' suggestion)
*Web Links
USPTO: US20070242395A1
國家/地區
美國

欲了解更多信息,請點擊 這裡
移動設備