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Measuring the Switching Time of a Bistable Magnetic Element

IP.com Disclosure Number: IPCOM000097703D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Shevel, WL: AUTHOR

Abstract

Measuring small switching times of 1... 10 nanoseconds for a bistable magnetic element normally requires equipment of very high bandwidth. Such measuring is also achieved by employing conventional electronic apparatus possessing only moderate bandwidth having a rise time of only 1 microsecond.

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Measuring the Switching Time of a Bistable Magnetic Element

Measuring small switching times of 1... 10 nanoseconds for a bistable magnetic element normally requires equipment of very high bandwidth. Such measuring is also achieved by employing conventional electronic apparatus possessing only moderate bandwidth having a rise time of only 1 microsecond.

Switching time is the duration of field pulse required to irreversibly switch a given percentage of magnetic flux that is switched when completely reversing the magnetic state of a bistable magnetic core.

A pulse program of set and reset is employed. The reset pulse has a fixed amplitude and duration and is provided by Generator 1. The set pulse has a variable width and amplitude and is derived from Generator 2. The amplitude of the reset pulse is sufficiently high to completely reset the magnetic state of the core. With a given width of set pulse, the amplitude is initially set sufficiently high to completely set the material of the core. It is then lowered until the amount of flux switched irreversibly during the set pulse is equal to a fixed percentage, e. g,, 90%, of that switched irreversibly when completely setting the material of the core. At this point, the current amplitude is noted as is the length of set pulse. This set pulse length is the switching time for the noted current pulse.

The sense output of the magnetic core is integrated by a RC integrator and applied to the vertical amplifier of the oscillo...