Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2010-05-12
2010-11-16
Cao, Allen T (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
07835118
ABSTRACT:
A method and apparatus for detecting the presence of magnetic beads is disclosed. By providing both a static magnetic field and a magnetic field that alternates in the MHz range, or beyond, the bead can be excited into FMR (ferromagnetic resonance). The appearance of the latter is then detected by a magneto-resistive type of sensor. This approach offers several advantages over prior art methods in which the magnetic moment of the bead is detected directly.
REFERENCES:
patent: 5768240 (1998-06-01), Hiraga
patent: 5841744 (1998-11-01), Menke et al.
patent: 5981297 (1999-11-01), Baselt
patent: 6518747 (2003-02-01), Sager et al.
patent: 6743639 (2004-06-01), Tondra
patent: 6744704 (2004-06-01), Funaya et al.
patent: 6875621 (2005-04-01), Tondra
patent: 2006/0020371 (2006-01-01), Ham et al.
patent: 2008/0221432 (2008-09-01), Zhou
“A biosensor based on magnetoresistance technology,” by David R. Baselt et al., Biosensors & Bioelectronics 13 (1998) pp. 731-739.
“Ferromagnetic resonance of monodisperse Co particles,” by U. Wiedwald et al., J. Vac. Sci. Technol. A 19(4), Jul./Aug. 2001, pp. 1773-1776, 2001 American Vacuum Society.
“Superparamagnetism and Transverse Susceptibility in Magnetic Nanoparticle Systems,” by L. Spinu et al., IEEE Transactions on Magnetics, vol. 36, No. 5, Sep. 2000, pp. 3032-3034.
“Analytical and Micromagnetic Modeling for Detection of a Single Magnetic Microbead or Nanobead by Spin Valve Sensors,” by Guanxiong Li et al., IEEE Transactions on Magnetics, vol. 38, No. 5, Sep. 2003, pp. 3313-3315.
“Model and Experiment of Detecting Multiple Magnetic Nanoparticles as Biomolecular Labels by Spin Valve Sensors,” by Guanxiong Li et al., IEEE Transactions on Magnetics, vol. 40, No. 4, Jul. 2004, pp. 3000-3002.
“The BARC biosensor applied to the detection of biological warfare agents,” by R.L. Edelstein et al., Biosensors & Bioelectronics 14 (2000) pp. 805-813.
“Towards a magnetic microarray for sensitive diagnostics,” by Shan X. Wang et al., Journal of Magnetism and Magnetic Materials 293, (2005), pp. 731-736.
“A DNA array sensor utilizing magnetic microbeads and magnetoelectronic detection,” by M.M. Miller et al., Journal of Magnetism and Magnetic Materials 225 (2001), pp. 138-144.
“Detection of single micron-sized magnetic bead and magnetic nanoparticles using spin valve sensors for biological applications,” by Guanxion Li et al., Journal of Applied Physics, vol. 93, No. 10, May 15, 2003, pp. 7557-7559.
“Biodetection using magnetically labeled biomolecules and arrays of spin valve sensors (invited),” by H.A. Ferreira et al., Journal of Applied Physics, vol. 93, No. 10, May 15, 2003, pp. 7281-7286.
“Single magnetic microsphere placement and detection on-chip using current line designs with integrated spin valve sensors: Biotechnological applications,” Journal of Applied Physics, vol. 91, No. 10, May 15, 2002, pp. 7786-7788.
Ferromagnetic resonance in periodic particle arrays, by S. Jung et al., Physical Review B 66, 132401 (2002), pp. 1-4.
Ferromagnetic resonance in a suspension of single-domain particles, by Yuri L. Raikher et al., Physical Review B, vol. 50, No. 9, Sep. 1, 1994, pp. 6250-6259.
“Thermally excited ferromagnetic resonance as diagnostic tool for spin valve heads,” by Yuchen Zhou et al., Journal of Applied Physics, vol. 93, No. 10, May 15, 2003, pp. 8579-8581.
“Ferromagnetic resonance in ferrite nanoparticles with uniaxial surface anisotropy,” by V.P. Shilov et al., Journal of Applied Physics, vol. 85, No. 9, May 1, 1999, pp. 6642-6647.
“Stochastic resonance and phase shifts in superparamagnetic particles,” by Yuri L. Raikher et al., Physical Review B, vol. 52, No. 5, Aug. 1, 1995, pp. 3493-3498.
“Ferromagnetic resonance evidence for superparamagnetism in a partially crystallized metallic glass,” by R.S. De Biasi et al., Physical Review B, vol. 42, No. 1, Jul. 1, 1990, pp. 527-529.
“High-frequency ferromagnetic resonance on ultrafine cobalt particles,” by M. Respaud et al., Physical Review B, vol. 59, No. 6, Feb. 1, 1999, pp. R3934-R3937.
“Micromagnetic calculations of ferromagnetic resonance in submicron ferromagnetic particles,” by S. Jung et al., Physical Review B 66, 132405, (2002), pp. 1-4.
“In situ detection of single micron-sized magnetic beads using magnetic tunnel junction sensors,” by Weifeng Shen et al., Applied Physics Letters 86, 253901 (2005), pp. 1-3.
“Effect of spin-valve sensor magnetostatic fields on nanobead detection for biochip applications,” by H.A. Ferreira et al., Journal of Applied Physics 97, 10Q904 (2005), pp. 1-3.
“Effective-susceptibility tensor for a composite with ferromagnetic inclusions: Enhancement of effective-media theory and alternative ferromagnetic approach,” by V.B. Bregar et al., Journal of Applied Physics, vol. 95, No. 11, Jun. 1, 2004, pp. 6289-6293.
Microwave Ferrites and Ferrimagnetics, by Benjamin Lax, Ph.D et al., Lincoln Laboratory Publications, McGraw-Hill Book Company, Inc. New York, Copyright 1962, Chapter 4, Ferromagetic Resonance, pp. 145-151.
Ferromagnetic Resonance, The Phenomenon of Resonant Absorption of a High-Frequency Magnetic Field in Ferromagnetic Substances, by S. V. Vonsovskii, Pergamon Press, New York, Copyright 1966, pp. 18-19 and 40-47.
Ackerman Stephen B.
Cao Allen T
Headway Technologies Inc.
Saile Ackerman LLC
LandOfFree
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