march meeting 2010
Download
Skip this Video
Download Presentation
March Meeting 2010

Loading in 2 Seconds...

play fullscreen
1 / 13

March Meeting 2010 - PowerPoint PPT Presentation


  • 131 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' March Meeting 2010' - adelio


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
march meeting 2010

March Meeting 2010

Huanlong Liu

femtosecond magnetization dynamics using the inverse faraday effect
Femtosecond magnetization dynamics using the inverse Faraday effect

THEO RASING, Radboud University Nijmegen

A33.4

background and experiment techniques
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
Results
  • Laser stay at the same position:
  • Laser move fast:
evolution of the domains
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
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
Mechanisms of spin torque driven ballistic precessional switching

OUKJAE LEE et al, Cornell University

J37.7

sample and results
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

slide9
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
Temperature ~ exchange-bias

T > TN

T < TN

  • Normal
  • AF

R

R

H

H

FM

FM

Normal

AF

switching method
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
Dynamic spin valve

SEZEN DEMIRTAS et al, University of Texas

V36.2

ad