2017
DOI: 10.1103/physrevb.96.241402
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Spin noise and damping in individual metallic ferromagnetic nanoparticles

Abstract: We introduce a highly sensitive and relatively simple technique to observe magnetization motion in single Ni nanoparticles, based on charge sensing by electron tunneling at millikelvin temperature. Sequential electron tunneling via the nanoparticle drives nonequilibrium magnetization dynamics, which induces an effective charge noise that we measure in real time. In the free spin diffusion regime, where the electrons and magnetization are in detailed balance, we observe that magnetic damping time exhibits a pea… Show more

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Cited by 2 publications
(2 citation statements)
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“…With electron transport, magnetoresistance is exploited in various ways ultimately boiling down to Slonczewski's theories involving spin-dependent transport 5 . Some devices used include magnetic tunnel junctions (MTJs) 6,7 , spin valves 8 , and nanoparticles embedded inside a tunnel junction [9][10][11][12][13][14] . Previous studies of switching dynamics in MTJs using a) Electronic mail: JFDark@gatech.edu electron transport have used low impedance samples at room temperature 15,16 .…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…With electron transport, magnetoresistance is exploited in various ways ultimately boiling down to Slonczewski's theories involving spin-dependent transport 5 . Some devices used include magnetic tunnel junctions (MTJs) 6,7 , spin valves 8 , and nanoparticles embedded inside a tunnel junction [9][10][11][12][13][14] . Previous studies of switching dynamics in MTJs using a) Electronic mail: JFDark@gatech.edu electron transport have used low impedance samples at room temperature 15,16 .…”
Section: Introductionmentioning
confidence: 99%
“…For this article, high impedance MTJs (∼1 MΩ) are studied at cryogenic temperatures. The higher impedance MTJs and low temperature environment allow for future use of the same measurement system to study ferromagnetic quantum dots at higher bandwidths 14 .…”
Section: Introductionmentioning
confidence: 99%