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M/M S. H. AMR. GMR AMR. R // = R T + D R. Probing Magnetic Configurations in Co/Cu Multilayered Nanowires Jared Wong, Peter Greene, Randy Dumas, and Kai Liu Department of Physics, University of California, Davis, California, 95616, USA Applied Physics Letters 94 ,032504 (2009). - PowerPoint PPT Presentation
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Probing Magnetic Configurations in Co/Cu Multilayered NanowiresJared Wong, Peter Greene, Randy Dumas, and Kai Liu
Department of Physics, University of California, Davis, California, 95616, USAApplied Physics Letters 94,032504 (2009)
Fabrication via Electrodepostion
TEMCourtesy of Daniel Masiel and Nigel D.
Browning, UC Davis
Magnetic Properties
Reversal Mechanisms in Fe Nanodisks
Magnetoresistance Properties
Summary
H
H
-4 -2 0 2 4
-1.0
-0.5
0.0
0.5
1.0
[Co(10nm)/Cu(250nm)]5
Perpendicular to wire Parallel to wire
M/M
S
H (kOe)
-4 -2 0 2 4
-1.0
-0.5
0.0
0.5
1.0
[Co(55nm)/Cu(350nm)]4
Perpendicular to wire Parallel to wire
M/M
S
H (kOe)
0
0.5
1
1.5
-0.9 -0.6 -0.3 0 0.3 0.6 0.9
10 nm32 nm37 nm39 nm41 nm55 nm
W(M
/Ms)
/ W(0
)
M / Ms
M/MS
H
R. K. Dumas, et al,
PRB 75, 134405 (2007); APL 91, 202501 (2007).
2 ( , )1( , )
2R
RR
M H HH H
H H
FORC distribution
2R
C
H HH
2R
B
H HH
Local Coercivity:
Bias Field:
50nm diameter [Co(5nm)/Cu(8nm)]400
H (Oe)
H wiresH // wires
-5.0 -2.5 0.0 2.5 5.0
4.56
4.57
(a) Field Parallel to Wire
R (
Oh
m)
H (kOe)
Decreasing field Increasing field
-5.0 -2.5 0.0 2.5 5.0
4.54
4.55
4.56
4.57
(b) Field Perpendicular to Wire
R (
Oh
m)
H (kOe)
Decreasing field Increasing field
2cos)( RRR T R RR
GMRAMR
AMR
200nm diameter [Co(50nm)/Cu(10nm)]150
200nm diameter wires
Superposition of AMR (vortex core) and GMR
0.1
0.2
0.3
0.4
0.5
Wire
// Wire
0 10 20 30 40 50 60
Coe
rciv
ity
(kO
e)
Co Thickness (nm)
0
10
20
30
40
0 10 20 30 40 50 60
Rem
anen
ce (
%)
Co Thickness (nm)
• Investigated magnetization reversal mechanisms in Co nanodisks embedded in multilayered nanowires by changing the Co aspect ratio.
•Captured magnetic and magnetoresistance "fingerprints" of single domain vs. vortex state reversal:in 200 nm nanowires, single domain for Co thickness < 32nm and vortex state for Co thickness > 37 nm.
K. Liu et al, PRB 51, 7381 (1995).
CITRIS, NSF (Grant Nos. ECCS-0725902 and PHY-0649297) and the Alfred P. Sloan Foundation
[Co(10nm)/Cu(250nm]5 [Co(55nm)/Cu(350nm]4
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