公开(公告)号：WO1997000506A1

公开(公告)日：1997-01-03

申请号：PCT/US1996008676

申请日：1996-06-04

Applicant: ALLIEDSIGNAL INC.

Inventor： ALLIEDSIGNAL INC. ,  COLLINS, Aliki ,  MARTIS, Ronald ,  AMBASZ, Victor

IPC: G08B13/24

CPC classification number: G08B13/2408 ,  G08B13/2442 ,  H01F1/0304 ,  H01F1/15316

Abstract: A magnetic theft detection system includes a glassy metal alloy strip having a value of magnetostriction near zero. The strip has been annealed to produce a step change in the magnetization versus applied field behavior (B-H loop) thereof, and has a composition consisting essentially of the formula: (Co Fe)100-x (Si B)x where 20

Abstract translation: 磁性盗窃检测系统包括具有接近零的磁致伸缩值的玻璃状金属合金带。 该带已经退火以产生磁化强度相对于其施加的磁场行为（BH环）的阶梯变化，并且具有基本上由以下结构组成的组成：（Co Fe）100-x（Si B）x，其中20 < 在氧化气氛中退火金属合金带导致表面氧化物的形成，然后是形成一个表面氧化物 特征晶体Co层，厚度在1〜2μm的范围内。 结晶Co层的厚度确定阈值磁场的值，并由退火条件和铸态表面化学和结构控制。

公开(公告)号：EP0832476A1

公开(公告)日：1998-04-01

申请号：EP96919057.0

申请日：1996-06-04

Applicant: AlliedSignal Inc.

Inventor： COLLINS, Aliki ,  MARTIS, Ronald ,  AMBASZ, Victor

IPC: G08B13 ,  H01F1

CPC classification number: G08B13/2408 ,  G08B13/2442 ,  H01F1/0304 ,  H01F1/15316

Abstract: A magnetic theft detection system includes a glassy metal alloy strip having a value of magnetostriction near zero. The strip has been annealed to produce a step change in the magnetization versus applied field behavior (B-H loop) thereof, and has a composition consisting essentially of the formula: (Co Fe)100-x (Si B)x where 20 « x « 23 and 15.4 « Co/Fe « 15.9 and 7.5 « B/Si « 9. Annealing of the metal alloy strip in an oxidizing atmosphere causes the formation of a surface oxide followed by a distinctive crystalline Co-layer with thickness in the range of 1 to 2 νm. The thickness of the crystalline Co-layer determines the value of the threshold magnetic field and is controlled by the annealing condition and the as cast surface chemistry and structure.

公开(公告)号：EP0832476B1

公开(公告)日：1999-11-24

申请号：EP96919057.8

申请日：1996-06-04

Applicant: AlliedSignal Inc.

Inventor： COLLINS, Aliki ,  MARTIS, Ronald ,  AMBASZ, Victor

IPC: G08B13/24 ,  H01F1/153

CPC classification number: G08B13/2408 ,  G08B13/2442 ,  H01F1/0304 ,  H01F1/15316

Abstract: A magnetic theft detection system includes a glassy metal alloy strip having a value of magnetostriction near zero. The strip has been annealed to produce a step change in the magnetization versus applied field behavior (B-H loop) thereof, and has a composition consisting essentially of the formula: (Co Fe)100-x (Si B)x where 20 « x « 23 and 15.4 « Co/Fe « 15.9 and 7.5 « B/Si « 9. Annealing of the metal alloy strip in an oxidizing atmosphere causes the formation of a surface oxide followed by a distinctive crystalline Co-layer with thickness in the range of 1 to 2 νm. The thickness of the crystalline Co-layer determines the value of the threshold magnetic field and is controlled by the annealing condition and the as cast surface chemistry and structure.