公开(公告)号：WO9747982A3

公开(公告)日：1998-02-19

申请号：PCT/IB9700566

申请日：1997-05-16

Applicant: PHILIPS ELECTRONICS NV ,  PHILIPS NORDEN AB

Inventor： SCHEP CORNELIS MARINUS ,  GIJS MARTINUS ADELA MARIA

IPC: G01R33/09 ,  G01R33

CPC classification number: G01R33/09

Abstract: A magneto-resistive magnetic field sensor comprising two magnetic layers (1, 2) which are mutually interconnected via a constriction (7). In a particular embodiment, the magnetic layers (1, 2) are separated by an intermediate non-metallic layer (3) containing a hole (5) which is filled with magnetic material so as to form the constriction (7). In an alternative embodiment, the magnetic layers (1, 2) and the constriction (7) are substantially coplanar (fig. 8). In a preferential embodiment, the width (wc) of the constriction (7) is smaller than one micron, and is ideally of the order of 100 nm. By measuring the electrical resistance across the constriction, i.e. with a current-flow from one magnetic layer (1) to the other magnetic layer (2) via the constriction (7), the relative role of inter-domain resistance effects with respect to intra-domain resistance effects is increased, leading to a correspondingly increased magneto-resistance ratio. In addition, because the electrical properties of the sensor then derive principally from the constriction (7), whereas its magnetic properties derive primarily from the magnetic layers (1, 2), it is possible to independently adjust the electrical and magnetic characteristics of the sensor, at least to a large degree.

公开(公告)号：WO9526547A3

公开(公告)日：1995-11-16

申请号：PCT/IB9500124

申请日：1995-03-01

Applicant: PHILIPS ELECTRONICS NV ,  PHILIPS NORDEN AB

Inventor： SCHOENENBERGER CHRISTIAN ,  GIJS MARTINUS ADELA MARIA ,  GIESBERS JACOBUS BERNARDUS ,  PALS JAN ALBERTUS

IPC: C23C14/14 ,  G01R33/09 ,  G11B5/00 ,  G11B5/39 ,  H01F10/08 ,  H01F10/30 ,  H01F10/32 ,  H01L43/08 ,  H01L43/10 ,  H01L43/12 ,  G11B

CPC classification number: H01L43/08 ,  B82Y10/00 ,  B82Y25/00 ,  G01R33/093 ,  G11B5/3903 ,  G11B5/3925 ,  G11B2005/3996 ,  H01L43/12

Abstract: A magneto-resistive device comprising a magnetic multilayer structure (9) which is deposited within a connective passage (7) running between and emerging into two opposed surfaces (S1, S2) of a film (5), successive constituent layers of the multilayer structure (9) being located at increasing distance from one of these surfaces (S1, S2). Such a multilayer structure (9) is preferably deposited using electrochemical techniques, and can be incorporated into an ultra-magnetic head employing the so-called CPP measuring geometry.