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Giant Magnetoresistance: Experiment

Authored by: Jack Bass

Handbook of Spin Transport and Magnetism

Print publication date:  August  2011
Online publication date:  April  2016

Print ISBN: 9781439803776
eBook ISBN: 9781439803783
Adobe ISBN:

10.1201/b11086-7

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Abstract

This chapter reviews experimental data on giant magnetoresistance (GMR) in magnetic multilayers composed of ferromagnetic (F) and nonmagnetic (N) metals. Since Chapter 5 reviews the theory underlying GMR [1], theoretical issues are treated only as needed to motivate and understand experimental data. As background, the review begins with a brief overview of the MR for a single magnetic film—called anisotropic magnetoresistance (AMR). It then covers, in more detail, the traditional current-in-plane (CIP) MR and the current-perpendicular-to-plane (CPP) MR in multilayers. Results on current-at-an-angle-to-the-plane (CAP) MR in multilayers [2,3] and MR in granular films (gMR) [46] are treated only briefly. Figure 4.1a shows the different current directions for CIP and CPP. In a real CIP film, the aspect ratio in Figure 4.1a is inverted—the length of the CIP film in the direction of the current flow is much greater than the total thickness of its layers.

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