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Title: Understanding all-optical spin switching: Comparison between experiment and theory

Journal Article · · Modern Physics Letters B
 [1];  [1];  [2];  [1];  [3]
  1. Indiana State Univ., Terre Haute, IN (United States)
  2. Lanzhou Univ. (China)
  3. Univ. of Missouri, St. Louis, MO (United States)

We report that information technology depends on how one can control and manipulate signals accurately and quickly. Transistors are at the core of modern technology and are based on electron charges. But as the device dimension shrinks, heating becomes a major problem. The spintronics explores the spin degree of electrons and thus bypasses the heat, at least in principle. For this reason, spin-based technology offers a possible solution. In this review, we survey some of the latest developments in all-optical switching (AOS), where ultrafast laser pulses are able to reverse spins from one direction to the other deterministically. But AOS only occurs in a special group of magnetic samples and within a narrow window of laser parameters. Some samples need multiple pulses to switch spins, while others need a single-shot pulse. To this end, there are several models available, but the underlying mechanism is still under debate. This review is different from other prior reviews in two aspects. First, we sacrifice the completeness of reviewing existing studies, while focusing on a limited set of experimental results that are highly reproducible in different labs and provide actual switched magnetic domain images. Second, we extract the common features from existing experiments that are critical to AOS, without favoring a particular switching mechanism. We emphasize that given the limited experimental data, it is really premature to identify a unified mechanism. Lastly, we compare these features with our own model prediction, without resorting to a phenomenological scheme. We hope that this review serves the broad readership well.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-06ER46304; AC02-05CH11231
OSTI ID:
1544190
Journal Information:
Modern Physics Letters B, Vol. 32, Issue 28; ISSN 0217-9849
Publisher:
World Scientific PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism journal September 2019
Theoretical Investigation of All Optical Switching by Intersystem Crossing journal December 2019
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