Electronic device using magnetic components

Details Electronic device using magnetic components Electronic device using magnetic components

1995-09-28

1997-12-09

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428216, 428 653, 428 655, 428611, 428652, 428653, 428671, 428672, 428673, 428675, 428676, 428692, 428900, 324252, 338 32R, 360 86, 360 9701, 360135, 360113, B32B 1500

Patent

active

056958641

ABSTRACT:
In the present invention, electrons flow through a free or excitable magnet, or reflect from it, to make its magnetization respond. To accomplish this, the spin vectors of the flowing electrons are preferentially polarized by an auxiliary ferromagnet, whose moment orientation is fixed. The electrons flow between the fixed and free ferromagnets through a non-magnetic metallic spacer which is thick enough to make the static inter-magnetic exchange coupling negligible. While transmitting thru or reflecting from the free ferromagnet, the spins of the moving electrons interact by quantum-mechanical exchange with the local, permanently present, spontaneously-polarized electron spins of the free magnet. This interaction causes a transfer of vectorial angular momentum between the several metallic layers in the device which causes the magnetization vector of the free magnet to change its direction continually with time. Thus excited, the magnetization vector will precess about its original axis. The precession cone angle will either attain a new equilibrium value which will be sustained by the current or will increase beyond 90.degree. and precess with decreasing amplitude until the magnetization vector has reversed by 180.degree. from its initial direction (i.e., switched).

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Y. Lassailly et al, The American Physical Society, Physical Rev. B, vol. 50, No. 17, 1 Nov. 1994-I, pp. 50-53, entitled "Spin-dependent transmission of low-energy electrons through ultrathin magnetic layers".
A. Fert et al, Journal of Magnetism and Magnetic Materials 140-144 (Feb. 1995) 1-8, entitled: "Layered magnetic structures: interlayer exchange coupling and giant magnetoresistance".
J.C. Sloncqewski, The American Physical Society, Physical Review B, vol. 39, No. 10, 1 Apr. 1989, pp. 6995-7002, entitled "Conductance and exchange coupling of two ferromagnets separated by a tunneling barrier".
T. Miyazaki et al, Journal of Magnetism and Magnetic Materials 139 (Jan. 1995) L231-L234, entitled "Giant magnetic tunneling effect in Fe/A1.sub.2 O.sub.3 junction".
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