1. Stanford Synchrotron Radiation Laboratory, PO Box 20450, Stanford, California 94309, USA
2. Landau Institute for Theoretical Physics, Kosygin str. 2, Moscow 117940, Russia
3. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, USA
4. Seagate Technology LLC, Pittsburgh, Pennsylvania 15222, USA

Correspondence to: J. Stöhr¹ Email: stohr@slac.stanford.edu

Abstract

In magnetic memory devices, logical bits are recorded by selectively setting the magnetization vector of individual magnetic domains either 'up' or 'down'. In such devices, the fastest and most efficient recording method involves precessional switching^{1, 2, 3, 4}: when a magnetic field B_p is applied as a write pulse over a period , the magnetization vector precesses about the field until B_p reaches the threshold value at which switching occurs. Increasing the amplitude of the write pulse B_p might therefore substantially shorten the required switching time and allow for faster magnetic recording. Here we use very short pulses of a very high magnetic field⁵ to show that under these extreme conditions, precessional switching in magnetic media supporting high bit densities no longer takes place at well-defined field strengths; instead, switching occurs randomly within a wide range of magnetic fields. We attribute this behaviour to a momentary collapse of the ferromagnetic order of the spins under the load of the short and high-field pulse, thus establishing an ultimate limit to the speed of deterministic switching and magnetic recording.

1. Stanford Synchrotron Radiation Laboratory, PO Box 20450, Stanford, California 94309, USA
2. Landau Institute for Theoretical Physics, Kosygin str. 2, Moscow 117940, Russia
3. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, USA
4. Seagate Technology LLC, Pittsburgh, Pennsylvania 15222, USA

Correspondence to: J. Stöhr¹ Email: stohr@slac.stanford.edu

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