A sensor may include a core and a coil. The core may include a rectangular substrate, a layer of magnetically-permeable material disposed on the substrate, and an adhesive rigidly coupling two ends of the substrate so as to form a tube with the rectangular substrate. The coil may be wound on the tube. The core may further include a layer of radiopaque material. The core may further include a flex pad for electrically coupling the coil with an external system.

It has been difficult to manufacture a large-capacity transformer having a laminated iron core structure using an amorphous alloy material easily. A laminated iron core structure includes a laminated iron core configured by aligning a plurality of laminated iron core blocks each configured by laminating iron core materials in a direction different from a lamination direction, a first frame extending along an outer periphery of the laminated iron core and a partition plate arranged between the plurality of laminated iron core blocks.

A magnetic core includes a nanocrystalline alloy ribbon having a composition represented by FeCu.sub.xB.sub.ySi.sub.zA.sub.aX.sub.b, where 0.6≤x<1.2, 10≤y≤20, 0≤(y+z)≤24, and 0≤a≤10, 0≤b≤5, all numbers being in atomic percent, with the balance being Fe and incidental impurities, and where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements. The nanocrylstalline alloy ribbon has a local structure such that nanocrystals with average particle sizes of less than 40 nm are dispersed in an amorphous matrix and are occupying more than 30 volume percent of the ribbon.

A magnetic core includes a nanocrystalline alloy ribbon having a composition represented by FeCu.sub.xB.sub.ySi.sub.zA.sub.aX.sub.b, where 0.6≤x<1.2, 10≤y≤20, 0≤(y+z)≤24, and 0≤a≤10, 0≤b≤5, all numbers being in atomic percent, with the balance being Fe and incidental impurities, and where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements. The nanocrylstalline alloy ribbon has a local structure such that nanocrystals with average particle sizes of less than 40 nm are dispersed in an amorphous matrix and are occupying more than 30 volume percent of the ribbon.

A method for producing an Fe-based nanocrystalline alloy ribbon, the method including a step of supplying a molten Fe-based alloy onto a rotating chill roll, and rapidly solidifying the molten Fe-based alloy that has been supplied onto the chill roll, thereby obtaining an Fe-based amorphous alloy ribbon having a free solidified surface and a roll contact surface, and a step of heat-treating the Fe-based amorphous alloy ribbon, thereby obtaining an Fe-based nanocrystalline alloy ribbon; wherein an outer peripheral part of the chill roll is composed of a Cu alloy, and a thermal conductivity of the outer peripheral part is from 70 W/(m.Math.K) to 225 W/(m.Math.K).

A method of manufacturing an amorphous alloy magnetic core, which includes preparing a layered body by layering amorphous alloy thin strips one on another, and has one end face and another end face in a width direction of the thin strips and an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the thin strips; forming a hole passing through from the one end face of the layered body as a starting point; subjecting the layered body to which the hole has been formed to a heat treatment while measuring an internal temperature of the hole; and forming a resin layer which blocks the hole and covers at least a part of the one end face by coating and curing a two-liquid mixed type epoxy resin composition having a viscosity of from 38 Pa.Math.s to 51 Pa.Math.s and a T. I. value of from 1.6 to 2.7 on at least a part of at least the one end face of the layered body after being subjected to the heat treatment.

An amorphous alloy magnetic core including a layered body in which amorphous alloy thin strips are layered one on another, the layered body having one end face and another end face in a width direction of the amorphous alloy thin strips, an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the amorphous alloy thin strips, and a hole passing through from a part of the one end face as a starting point, the width direction corresponding to a depth direction of the hole.

An amorphous alloy magnetic core including a layered body in which amorphous alloy thin strips are layered one on another, the layered body having one end face and another end face in a width direction of the amorphous alloy thin strips, an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the amorphous alloy thin strips, and a hole passing through from a part of the one end face as a starting point, the width direction corresponding to a depth direction of the hole.

An amorphous alloy magnetic core including a layered body in which amorphous alloy thin strips are layered one on another, the layered body having one end face and another end face in a width direction of the amorphous alloy thin strips, an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the amorphous alloy thin strips, and a hole passing through from a part of the one end face as a starting point, the width direction corresponding to a depth direction of the hole.

An amorphous alloy magnetic core including a layered body in which amorphous alloy thin strips are layered one on another, the layered body having one end face and another end face in a width direction of the amorphous alloy thin strips, an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the amorphous alloy thin strips, and a hole passing through from a part of the one end face as a starting point, the width direction corresponding to a depth direction of the hole.