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Zero Magnetostriction or Slightly Negative Magnetostriction of Thin Films Based on CoTi Alloys

IP.com Disclosure Number: IPCOM000051878D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Aboaf, JA: AUTHOR [+2]

Abstract

The saturation magnetostriction of amorphous CoTi films (14 to 22 at. is independent of the titanium concentration. Its value is +1.2 x 10/-6/ In some applications a zero or slightly negative magnetostriction is necessary.

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Zero Magnetostriction or Slightly Negative Magnetostriction of Thin Films Based on CoTi Alloys

The saturation magnetostriction of amorphous CoTi films (14 to 22 at. is independent of the titanium concentration. Its value is +1.2 x 10/-6/ In some applications a zero or slightly negative magnetostriction is necessary.

We have found that by adding boron to (a few atomic percent) amorphous Co(83)Ti(17) alloys results in zero or negative magnetostriction. The drawing shows the magnetostriction as a function of boron content.

Polycrystalline alloys of CoTi (less than 14 at. % Ti) have very high negative magnetostriction. The addition of boron reduces it for small boron content, and at about 15 or higher it reaches the value of CoB amorphous alloys (3.5 x 10/6/). If the addition of B and Ti is 15 at. %, the alloys are amorphous.

Alloys based on Co(83)Ti(17) with some boron have good magnetic properties (low coercivity) and are corrosion resistant.

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