|Nov24-05, 07:22 AM||#1|
for giant magnetoresistance with 3 layers suppose Fe-Cu-Fe, and suppose we take room temperature (300K) and moderate layer thickness (eg Fe = 30 Amstrong, Cu = 20 Amstrong),
what is the typical magnetoresistance we get? I mean the maximum resistance (in ohms) when the magnetization of the FM layers are antiparallel (i am not asking the GMR ratio delta r/ro).
Is it in the order of few tens of ohms, hundreds of ohms, kilo ohms ?
i just want rough estimate. all references i saw talk about the gmr ratio only, not the actual resistance.
|Nov24-05, 09:09 AM||#2|
If we just take the sheet or surface resistance of a 10 Å film, one would divide the bulk resistivity by the thickness: (10^-8 Ohm.m)/(10^-9 m) = 10 Ohm (per square).
(Of course, this does not really work when dimensions become smaller than the electron mean free path. I copper at room temperature, this is about 300 Å. It only gives a rough estimate.)
|May4-09, 12:03 AM||#3|
hey .. guys . ... I was wondering if any one did some exerimental work on GMR .. I have been trying to get GMR in nanowires but have not been successful .. I have tried varying pulse timing but have had no luck .... Can any one help me out??
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