AAWSAP DIRD, Metallic Spintronics, March 2010

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Contents
1. Introduction ......................................................................................................iv
2. Giant Magnetoresistance .................................................................................... 1
2.1 GMR Basics .........................................................................................1••········· 1
2.2 GMR Applications ........................................................................................ 3
3. Spin-Transfer-Torque ......................................................................................... 4
3.1 STT Basics ........................................................................................,........... 4
3.2 STT Experiments ............................................................................................... 7
3.3 STT Applications ................................................................................. ........... 10
3.4 STT-Driven Motion of Magnetic Domain Walls ........................................... 12
4, Antiferromagnetic Metal Spintronics ............................................................... 12
4.1 Antiferromagnetic GMR .........,............ .,....................................................... 13
4.2 Antiferromagnetic STT............................................................................... 14
5. Summary and Conclusions ............................................................................... 16
6. References ..............................................................................................,......... 18
Figures
Figure 1. In a Magnetic Multilayer, Several Atomic Layers of Magnetic Material
Alternate With Layers of Nonmagnetic Material ...................................... 1
Figure 2. Resistance of a Magnetic Multilayer R Versus Magnetic Field .................. 2
Figure 3. Differential Resistance dV/dI of a Mechanical Point Contact as a Function
of Current for a Series of Magnetic Fields................................................ 4
Figure 4. Device Schematics for STT Experiments ................................................. 5
Figure 5. Qualitative Picture of STT ....................................................................... 6
Figure 6. Torques on a Magnetic Moment in a Magnetic Field and Subject to an
Electrical Current......................................................................... , 1••••••••••• 7
Figure 7. Spin-Torque-Driven Magnetic Switching .................................................. 8
Figure 8. Oscillatory Voltage .................................................................................. 9
Figure 9. Scanning Transmission X-ray Microscopy Images ................................. 10
Figure 10. Conventional MRAM Cell ....................................................................... 11
Figure 11. Racetrack Memory Concept .................................................................. 12
Figure 12. Schematic of Point Contact to Sample Geometry ................................. 15
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