Surface magnetization dynamics at the nanosecond time scale

Sirotti, Fausto; Girlando, Simone; Spezzani, C.; Floreano, Luca; Torelli, Piero; Mirone, Alessandro; Panaccione, G.; Rossi, G.

doi:10.1016/s0168-9002(01)00676-3

Cited by 4 publications

(2 citation statements)

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“…A variable time delay with 1 ns steps between the clock pulse and the coil trigger enables the sample magnetization throughout the reversal to be determined every nanosecond. The experiment is surface sensitive and, as shown in previous studies [21], an Fe overlayer produces a much higher spin polarization than the vitrovac substrate and the polarization is dominated by an Fe film only 3 Å thick. Figure 3 shows a series of photoemssion spectra taken with a photon energy of 220 eV over the Fe and Co 3p core level regions for anti-parallel magnetizations of the vitrovac substrate (filled and open circles) as a function of coverage for clusters with a mean size of 141 atoms.…”

Section: Dynamic Magnetic Measurementssupporting

confidence: 58%

Experimental Demonstration of a Ring-Cavity Q-Switched Fiber Regenerative Amplifier

Yang

2006

jjap

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The static and dynamic magnetic behaviour of Fe nanoclusters with controlled sizes in the range 140-270 atoms (1.5-1.8 nm) deposited in situ from a gas aggregation source on magnetic vitrovac amorphous ribbons has been studied using synchrotron radiation. The static magnetization of the cluster films in the exchange field of the substrates was measured as a function of coverage using magnetic linear dichroism in the angular distribution (MLDAD) of the Fe 3p core level photoemission. The switching dynamics were studied on the nanosecond timescale by time-resolved spin-polarized photoemission. For a given particle size, the magnetization of the Fe cluster film increases with coverage and saturates at a coverage of about 0.4 cluster monolayers. Modelling the growth of the magnetization gives an effective exchange field at the interface of ∼20 T. Dense cluster films with several cluster layers have an MLDAD signal at saturation that is ∼5% higher than a molecular beam epitaxy (MBE)grown film, indicating an enhanced spin moment even when clusters are in contact. Coating an exposed sub-monolayer cluster layer with Co increases the Fe MLDAD signal by 35%, indicating a substantially increased magnetic moment within the Fe clusters. At low coverages, below the percolation threshold, the switching dynamics of the sample remains the same as in the clean substrate. At around the percolation threshold, however, a significant acceleration of the magnetic reversal is observed with a fast component due to a reversal propagating through the cluster film. We show that, on average, each cluster switches in about 10 ns.

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Section: Dynamic Magnetic Measurementssupporting

confidence: 58%

Experimental Demonstration of a Ring-Cavity Q-Switched Fiber Regenerative Amplifier

Yang

2006

jjap

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Section: Dynamic Magnetic Measurementssupporting

confidence: 58%

Static and dynamic magnetic behaviour of iron nanoclusters on magnetic substrates

Binns¹,

Sirotti²,

Cruguel³

et al. 2003

J. Phys.: Condens. Matter

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Magnetisation dynamics of Fe nanoclusters exchange-coupled to magnetic substrates

Binns

Sirotti

Cruguel

et al. 2004

phys. stat. sol. (a)

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Synchrotron radiation was used to study exposed Fe nanoclusters with controlled sizes in the size range 140–270 atoms (1.5–1.8 nm) deposited in situ from a gas aggregation source on to magnetic vitrovac amorphous ribbons. Magnetic linear dichroism in the angular distribution (MLDAD) of the Fe 3p core level photoemission was used to show that the clusters are exchange‐coupled to the substrate with an interface molecular field of about 20 T. The switching dynamics was studied on the nanosecond timescale by time‐resolved spin‐polarised photoemission. At low coverages, below the percolation threshold, when the film consists of separated islands the switching dynamics of the cluster islands is identical to the clean substrate. At around the percolation threshold, however, the data indicates that the magnetic reversal propagates faster in the cluster film than in the substrate. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Surface magnetization dynamics at the nanosecond time scale

Cited by 4 publications

References 4 publications

Experimental Demonstration of a Ring-Cavity Q-Switched Fiber Regenerative Amplifier

Experimental Demonstration of a Ring-Cavity Q-Switched Fiber Regenerative Amplifier

Static and dynamic magnetic behaviour of iron nanoclusters on magnetic substrates

Magnetisation dynamics of Fe nanoclusters exchange-coupled to magnetic substrates

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