Browse Prior Art Database

Spin Resonance Memory Adder and Apparatus

IP.com Disclosure Number: IPCOM000098663D
Original Publication Date: 1959-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Smith, WV: AUTHOR

Abstract

The drawing shows a schematic representation of the memory apparatus. Information in the form of microwave pulses is incident, through a circulator, onto a cavity containing a paramagnetic crystal. The pulses affect the spins of the crystal and are affected by these spins. The reflected pulses come out of the arm of the circulator. The reflected pulses may be used in the form of a counter, with the reflected pulses being adjusted to be 0 or 1 for no carry and carry . For this circuit the spins in the cavities represent the binary input number. The digits may be interrogated nondestructively with very weak pulses which do not destroy the number. The distinction between the 0 and 1 in the cavity is that the 0 attenuates the test signal whereas the 1 amplifies the signal.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 86% of the total text.

Page 1 of 2

Spin Resonance Memory Adder and Apparatus

The drawing shows a schematic representation of the memory apparatus. Information in the form of microwave pulses is incident, through a circulator, onto a cavity containing a paramagnetic crystal. The pulses affect the spins of the crystal and are affected by these spins. The reflected pulses come out of the arm of the circulator. The reflected pulses may be used in the form of a counter, with the reflected pulses being adjusted to be 0 or 1 for no carry and carry . For this circuit the spins in the cavities represent the binary input number. The digits may be interrogated nondestructively with very weak pulses which do not destroy the number. The distinction between the 0 and 1 in the cavity is that the 0 attenuates the test signal whereas the 1 amplifies the signal.

A paramagnetic crystal having a spin of 1/2 may be used. The allowed directions of individual spins are either parallel to the field (S = +1/2, state 0 ) or antiparallel to the field (S = -1/2, state 1 ). State 0 is stable and state 1 is metastable, lasting for a time of the order of T(1), the spin-lattice relaxation time. The application of 18O degrees spin reversal pulses flip a 0 to a 1 with the absorption of energy from the pulse (attenuation), while an identical spin reversal pulse changes a 1 to a 0 with the release of energy to the pulse (amplification). In thermal equilibrium the population of the two spin levels differs, the lower energy 0 state ha...