Alliedsignal Inc.

Nve Corporation

Carl H Smith

V R Ramanan

Davidson M Nathasingh

John Silgailis

Catherine A Nordman

Zhenghong Qian

Robert M VonHoene

Albrecht Jander

A ferromagnetic thin-film based magnetic field sensor with first and second sensitive direction sensing structures each having a nonmagnetic intermediate layer with two major surfaces on opposite sides thereof having a magnetization reference layer on one and an anisotropic ferromagnetic material sensing layer on the other having a length in a selected length direction and a smaller width perpendicular thereto and parallel to the relatively fixed magnetization direction. The relatively fixed magnetization direction of said magnetization reference layer in each is oriented in substantially parallel to the substrate but substantially perpendicular to that of the other. An annealing process is used to form the desired magnetization directions.

Two-axis magnetic field sensor

A magnetic metallic glass alloy exhibits, in combination, high saturation induction and low magnetic anisotropy energy. The alloy has a composition described by the formula Fe.sub.a Co.sub.b B.sub.c Si.sub.d C.sub.e, where 'a'-'e' are in atom percent, 'a' ranges from about 72 to about 84, 'b' ranges from about 2 to about 8, 'c' ranges from about 11 to about 16, 'd' ranges from about 1 to about 4, and 'e' is zero or ranges from about 3 to about 4, with up to about 1 atom percent of Mn being optionally present in the alloy, with the provisos that (i) when 'e' is zero and 'a' is greater than or equal to 80, 'b' cannot exceed 4, (ii) when 'e' is zero and 'a' is less than 80 by an amount x, 'b' cannot exceed (4+4x) and, (iii) the sum ('a'+'b'+'c'+'d'+'e') equals 100. Such an alloy is especially suited for use in large magnetic cores associated with pulse power applications requiring high magnetization rates. Examples of such applications include high power pulse sources for linear induction particle accelerators, induction modules for coupling energy from the pulse source to the beam of these accelerators, magnetic switches in power generators in inertial confinement fusion research, magnetic modulators for driving excimer lasers, and the like.

Iron rich metallic glasses having high saturation induction and superior

A magnetic metallic glass alloy exhibits, in combination, high saturation induction and low magnetic anisotropy energy. The alloy has a composition described by the formula Fe.sub.a Co.sub.b B.sub.c Si.sub.d C.sub.e, where 'a'-'e' are in atom percent, 'a' ranges from about 72 to about 84, 'b' ranges from about 2 to about 8, 'c' ranges from about 11 to about 16, 'd' ranges from about 1 to about 4, and 'e' ranges from 0 to about 4, with up to about 1 atom percent of Mn being optionally present. Such an alloy is especially suited for use in large magnetic cores associated with pulse power applications requiring high magnetization rates. Examples of such applications include high power pulse sources for linear induction particle accelerators, induction modules for coupling energy from the pulse source to the beam of these accelerators, magnetic switches in power generators in inertial confinement fusion research, magnetic modulators for driving excimer lasers, and the like.

The present invention is directed to a process for rapidly field annealing ferromagnetic cores and the cores produced thereby. A current is applied across a magnetizing source associated with a magnetizing core which induces a flux/voltage in the ferromagnetic core which is disposed about a leg of the magnetizing core. The flux/voltage in the second core induces a current in the second core which in turn induces a field in, and transverse to the width direction of, the ferromagnetic core. A second field may e applied to the ferromagnetic core during cooling. The cores produced display low core loss and either sheared over or square loop properties which are suitable for current and distribution type transformers respectively.

Rapid annealing method using shorted secondary technique

A magnetic core is fabricated from ferromagnetic metallic glass ribbon and mica paper insulation. The ribbon and insulation are co-wound, so that layers comprise alternate concentric rings. The wound core is then annealed in a vacuum or an inert atmosphere such as dry nitrogen or argon gas. Co-wound cores of this type exhibit excellent magnetic properties at high magnetization rates and high voltage hold off between adjacent laminations, and are particularly suited for pulse power applications.

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Chatham, NJ, United States of America

Carl H Smith