Journal
SCIENCE ADVANCES
Volume 3, Issue 11, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1603117
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Funding
- NSF Center for Energy Efficient Electronics
- Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the U.S. Department of Energy within the Nonequilibrium Magnetic Materials Program (MSMAG) [DE-AC02-05-CH11231]
- Center for Spintronic Materials, Interfaces, and Novel Architectures
- Microelectronics Advanced Research Corporation
- Defense Advanced Research Projects Agency
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The field of spintronics involves the study of both spin and charge transport in solid-state devices. Ultrafast magnetism involves the use of femtosecond laser pulses to manipulate magnetic order on subpicosecond time scales. We unite these phenomena by using picosecond charge current pulses to rapidly excite conduction electrons in magnetic metals. We observe deterministic, repeatable ultrafast reversal of the magnetization of a GdFeCo thin film with a single sub-10-ps electrical pulse. The magnetization reverses in similar to 10 ps, which is more than one order of magnitude faster than any other electrically controlled magnetic switching, and demonstrates a fundamentally new electrical switching mechanism that does not require spin-polarized currents or spin-transfer/orbit torques. The energy density required for switching is low, projecting to only 4 fJ needed to switch a (20 nm)(3) cell. This discovery introduces a new field of research into ultrafast charge currentdriven spintronic phenomena and devices.
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