Ferromagnetic alloys with high nickel content and high permeability
AssigneePitney Bowes Inc.
InventorsJohn O. Strom-Olsen, Piotr Z. Rudkowski
Life of this patent
Estimating the term…
Abstract
Nickel rich amorphous ferromagnetic alloys having a nickel content in the range of 35 to 55 atomic percent have been conceived. These alloys are in the amorphous state and exhibit high permeability relative to prior known amorphous ferromagnetic alloys. These nickel rich alloys can be produced by rapid solidification techniques without the need of subsequent heat treating.
Claims36
A marker for use in an electronic article surveillance system, the marker comprising:
- a ferromagnetic amorphous ferromagnetic element containing 35 to 55% nickel, up to 35% of at least one of iron and cobalt and a combination thereof and made by rapid solidification from a molten ferromagnetic alloy, and a carrier for said ferromagnetic amorphous element.
A marker for use in an electronic article surveillance system, the marker comprising:
- an amorphous ferromagnetic element made from a molten alloy containing 35 to 55% nickel, up to 35% of at least one of iron and cobalt, including a combination thereof and a carrier for said ferromagnetic amorphous element.
A marker for use in an electronic article surveillance system, the marker comprising:
- a rapidly solidified ferromagnetic amorphous fiber having 35 to 55% nickel, up to 35% of at least one of iron and cobalt, including a combination thereof, a length less than 15 millimeters and a cross-sectional area of less than 6.times.10.sup.-3 square millimeters.
A composite web of markers for use in an electronic article surveillance system, the composite web comprising:
- a web, a plurality of labels releasably supported by said web and a plurality of amorphous ferromagnetic elements having a composition containing 35 to 55% nickel and up to 35% of at least one of iron and cobalt and a combination thereof and supported by each of said labels.
A method of making a marker for use in an electronic article surveillance system, comprising the steps of:
- rapidly solidifying an amorphous ferromagnetic element having a composition containing 35 to 55% nickel and up to 35% of at least one of iron and cobalt and a combination thereof from a pool of molten alloy, and incorporating the resulting element within a support.
A method of making a composite web of markers for use in an electronic article surveillance system, comprising the steps of:
- providing a web of material, placing amorphous ferromagnetic marker elements having a composition containing 35 to 55% nickel and up to 35% of at least one of iron and cobalt and a combination thereof on the web, and wherein the material is divided into labels each having at least one marker element.
A marker for producing a detectable response in an electronic article surveillance system, the marker comprising:
- a support element, an amorphous ferromagnetic fiber having a composition containing 35 to 55% nickel and up to 35% of at least one of iron and cobalt and a combination thereof supported by the support element, the fiber having a cross sectional area of less than 66.times.10.sup.-3 square millimeters.
A ferromagnetic marker for use in an article surveillance system comprising:
- an amorphous ferromagnetic fiber having a composition containing 35 to 55% nickel and up to 35% of at least one of iron and cobalt and a combination thereof and an aspect ratio of greater than 50,
- said ferromagnetic amorphous fiber being positioned between two dielectric sheets, and said sheets being joined so as to hold said ferromagnetic amorphous fibers therebetween to form a marker.
An amorphous, ferromagnetic fiber having a composition containing 35 to 55% nickel and up to 35% of at least one of iron and cobalt and a combination thereof, a nominal diameter no greater than 80 microns and a t1/2 of less than 10 microseconds at a driving frequency of 6kHz and in a magnetic field of an amplitude in the order of one Oersted.
A ferromagnetic alloy, the composition comprising:
- N.sub.a C.sub.b F.sub.c S.sub.d B.sub.e M.sub.f
- where
- N is nickel
- C is cobalt
- F is iron
- S is silicon
- B is at least one of boron and phosphorous
- M is at least one of manganese, niobium, aluminum, chromium, vanadium and copper and
- "a-f" are in atom percent
- "a" ranges from 35 to 55
- "b" is equal to or less than 35
- "c" ranges from 0 to 35
- "d" is equal to or less than 30
- "e" is equal to or less than 30
- "f" ranges from 0 to 10,
- said above ranges being given in atomic percent.
Dependencies are inferred from the claim text.