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March Meeting 2010

March Meeting 2010. Huanlong Liu. Femtosecond magnetization dynamics using the inverse Faraday effect. THEO RASING, Radboud University Nijmegen A33.4. Background and experiment techniques. Photon polarization interacts with magnetization Sample: 20 nm GdFeCo film 40 fs laser pulse

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March Meeting 2010

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  1. March Meeting 2010 Huanlong Liu

  2. Femtosecond magnetization dynamics using the inverse Faraday effect THEO RASING, Radboud University Nijmegen A33.4

  3. Background and experiment techniques • Photon polarization interacts with magnetization • Sample: 20 nm GdFeCo film • 40 fs laser pulse • Circular polarized: can write to film • Linear polarized: cannot write to film – use to read

  4. Results • Laser stay at the same position: • Laser move fast:

  5. Evolution of the domains • Using σ+: • Using σ-: Same state Initial Driving Motion Laser pulsing 0.1 ps 0 380 ps time

  6. Magnetoresistance in magnetic nanostructures: the role of nonumiform current TATIANA RAPPOPORT [1] et. Al [1]: Universidade Federal do Rio de Janeiro H36.3 Resistance Network 500 nm Py R2 R1 Vertex: attract current Anti – vertex: attract or repel current 10 nm thickness

  7. Mechanisms of spin torque driven ballistic precessional switching OUKJAE LEE et al, Cornell University J37.7

  8. Sample and results • Tri-layer sample: • Switching time: • Due to dipole interaction: IAP->P > IP->AP sp Py 20 nm Py 5 nm Co 0.1 ns 0.3 ns 1 ns t

  9. Electrical Pulse Modification and Reversal of the exchange-Bias in Magnetic Tunnel Junction Structures YUN LI et al Cornell University J37. 10

  10. Temperature ~ exchange-bias T > TN T < TN • Normal • AF R R H H FM FM Normal AF

  11. Switching Method • Heat up… heat current R R R Hex Tunnel barrier: Fe60Co20B20: 3nm MgO: 1.2 ~ 1.8 nm Fe60Co20B20: 3nm H H H Pulse Amplitude

  12. Dynamic spin valve SEZEN DEMIRTAS et al, University of Texas V36.2

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