TITLE

Pinned synthetic ferrimagnets with perpendicular anisotropy and tuneable exchange bias

AUTHOR(S)
Sort, J.; Rodmacq, B.; Aultret, S.; Dieny, B.
PUB. DATE
September 2003
SOURCE
Applied Physics Letters;9/1/2003, Vol. 83 Issue 9, p1800
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Pinned synthetic ferrimagnets (syFerri) with perpendicular-to-plane magnetic anisotropy, of the form AP[sub 1]/Ru/AP[sub 2]/FeMn [where AP[sub 1] and AP[sub 2] are (Co/Pt) multilayers], have been prepared and characterized. The magnitudes of the exchange bias fields of both AP[sub 1] and AP[sub 2] can be tuned at room temperature by simply varying the relative number of (Co/Pt) repeats in each multilayer. This effect can be quantitatively interpreted by considering the different energy contributions involved during magnetization reversal. Moreover, from the values of these fields, the characteristic parameters of the system (i.e., coupling strength through the Ru and AP[sub 2]/FeMn pinning energy), can be evaluated. Interestingly, an extended plateau with a virtually constant magnetization is observed around zero field when the number of Co/Pt repeats in AP[sub 1] is equal or larger than in AP[sub 2]. This is very appealing for field sensor or memories applications using spin valves or tunnel junctions with perpendicular anisotropy, since it offers a large dynamic range over which the magnetic configuration of the syFerri remains stable. © 2003 American Institute of Physics.
ACCESSION #
10665016

 

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