Origins of Spintronics: Metals

1
ELEG 467/667 Spintronics

• Section 7
• Origins of Spintronics Metals
• Electron spin injection and relaxation
• Johnson and Silsbee experiment
• Jedema/vanWees experiment

2
Schulz and Latham, Observation of electron spin
resonance in copper, PRL 15, 148 (1965)
10-10
T1(s)
10-9
3
(No Transcript)
4
Johnson and Silsbee, PRL 55 1790 (1985)
and PRB 37 5326 (1988)
5
(No Transcript)
6
Johnson and Silsbee, PRL 55 1790 (1985)
and PRB 37 5326 (1988)
7
Johnson and Silsbee, PRL 55 1790 (1985)
and PRB 37 5326 (1988)
Hanle Effect
8
Johnson and Silsbee, PRL 55 1790 (1985)
and PRB 37 5326 (1988)
Hanle Effect
9
Jedema et al., Nature, 416 713 (2002)
10
Jedema et al., Nature, 416 713 (2002)
11
Van Son et al. PRL 58 2271 (1987)
Diffusive spin-transport
Ohms Law
Diffusion Equation
Normal Metal
Avg. potential
Half-Metallic Ferromagnet
12
Van Son et al. PRL 58 2271 (1987)
Diffusive spin-transport
Boundary resistance
Normal Metal
Ferromagnet
13
Fabian and Das Sarma, JVST B, 17, 1708 (1999)
Origins of Finite T1
Elliott-Yafet (Spin-orbit)
Dyakanov-Perel (k-dependent precession)
Bir-Aronov-Pikus (semiconductors)
14
Anisotropic Magneto-Resistance
2
15
Baibich et al., PRL 61 2472 (1988)
Giant Magneto-Resistance
c
H
a
b
I
50
16
RKKY coupling
Parkin et al., PRL 64 2304 (1990)
(Ruderman-Kittel-Kasuya-Yoshida)
17
Scanning electron microscopy with polarization
analysis (Celotta et al., JAP, 75, 6452 (1994))
18
(No Transcript)
19
Effect of partially diffusive scattering at
interfaces