METHOD AND APPARATUS FOR GENERATING ELECTRON SPIN REVERSAL IN FERRIMAGNETIC MATERIAL
Assignee
PRECISION DATA, INC., A CORP. OF CA
Filed
May 6, 1981
Granted
Jan 3, 1984
Location
MOUNTAIN VIEW CA US
Abstract
Methods and apparatus for reversibly altering magnetic characteristics or domains of ferrimagnetic material by photomagnetic means, particularly by electron spin reversal (spin-flip). Photomagnetic electron spin reversal and inversion creating cylinder domains and their surrounding toroid domains of oppositely directed intrinsic magnetization in ferrimagnetic thin film material are achieved by means of signal modulated circularly polarized laser radiation. Three different stable conditions are detectable. The invention has particular application as a fundamentally new aproach to erasable digital data storage, providing means and methods for photomagnetically alterable and erasable data storage which can be detected by observing polarization of optical radiation directed through the ferrimagnetic material.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Oct 19, 1981
Rescinded
Never rescinded
Duration
44y 8mo — still active
Inventor
- 1CARL H. BECKER
Record Details
- Patent number
- US 4424580
- Application
- 06260963
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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