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Minimum field strength in precessional magnetization reversal

Back¹, Allenspach, Weber

¹Laboratorium fur Festkorperphysik, ETH Zurich, CH-8093 Zurich, Switzerland. IBM Research Division, Zurich Research Laboratory, CH-8803 Ruschlikon, Switzerland. IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA.

Science (New York, N.Y.)

|August 7, 1999

Summary

Ultrafast magnetic field pulses can reverse magnetization in cobalt films. This discovery paves the way for faster magnetic recording technologies.

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Area of Science:

Condensed matter physics
Materials science

Background:

Magnetization reversal is crucial for magnetic data storage.
Controlling magnetization dynamics at ultrafast timescales is an ongoing challenge.

Purpose of the Study:

To investigate the feasibility of ultrafast magnetization reversal using picosecond magnetic field pulses.
To determine the optimal conditions for triggering magnetization reversal with minimal field strength.

Main Methods:

Applying in-plane magnetic field pulses as short as 2 picoseconds to thin cobalt films.
Varying the direction of the magnetic field pulses relative to the magnetization.

Main Results:

Magnetization reversal was achieved using 2-picosecond magnetic field pulses.
Maximum torque, leading to precessional reversal, occurred when the field was perpendicular to the magnetization.
Effective reversal was demonstrated with fields as low as 184 kiloamperes per meter.

Conclusions:

Picosecond magnetic field pulses are capable of ultrafast magnetization reversal in cobalt films.
The study highlights the potential for developing advanced, high-speed magnetic recording technologies.