March meeting 2010
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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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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

  • Circular polarized: can write to film

  • Linear polarized: cannot write to film – use to read


Results

  • Laser stay at the same position:

  • Laser move fast:


Evolution of the domains

  • Using σ+:

  • Using σ-:

Same state

Initial Driving Motion

Laser pulsing 0.1 ps

0

380 ps

time


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


Mechanisms of spin torque driven ballistic precessional switching

OUKJAE LEE et al, Cornell University

J37.7


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


Electrical Pulse Modification and Reversal of the exchange-Bias in Magnetic Tunnel Junction Structures

YUN LI et al Cornell University

J37. 10


Temperature ~ exchange-bias

T > TN

T < TN

  • Normal

  • AF

R

R

H

H

FM

FM

Normal

AF


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


Dynamic spin valve

SEZEN DEMIRTAS et al, University of Texas

V36.2


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