Unusual Current Perpendicular-to-Plane (CPP) Magnetoresistance (MR) for Thick Co Layers-Difference in MR for fcc and hcp Co

We report an unexpected difference in behavior of the CPP-MRs of double exchange-biased spin-valves, involving Permalloy (Py), Co, and Cu, when the Co layer is thin (t Co ¿ 20 nm) or thick (t Co ¿ 50 nm). Following Hehn et al., we attribute this difference to a change in direction of magnetization o...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2010-06, Vol.46 (6), p.1405-1408
Main Authors: Dassonneville, Bastien, Nguyen, Hoang Yen Thi, Acharyya, Rakhi, Loloee, Reza, Pratt, W. P., Bass, Jack
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Close packed lattices
Cross-disciplinary physics: materials science
rheology
current perpendicular-to-plane (CPP) resistance
Exact sciences and technology
Exchange
Face centered cubic lattice
Giant magnetoresistance
Hexagonal cells
Magnetic anisotropy
Magnetic field measurement
Magnetic force microscopy
Magnetic hysteresis
Magnetic multilayers
Magnetism
Magnetization
Magnetoresistance
Magnetoresistivity
Materials science
Other topics in materials science
Perpendicular magnetic anisotropy
Physics
spin-flipping
Stacking
Thin films
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Summary:We report an unexpected difference in behavior of the CPP-MRs of double exchange-biased spin-valves, involving Permalloy (Py), Co, and Cu, when the Co layer is thin (t Co ¿ 20 nm) or thick (t Co ¿ 50 nm). Following Hehn et al., we attribute this difference to a change in direction of magnetization of the Co with increasing t Co , with the magnetization lying in-plane for thin Co layers (t Co ¿ 20 nm), but tilting partially out of plane for thick Co layers (t Co ¿ 50 nm) by adopting a multidomain structure containing equal areas of "up" and "down" domains. If our attribution is correct, this is the first example of a qualitative change in giant magnetoresistance due to a change in Co structure from mainly fcc to mainly hcp.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2010.2040811