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Recent experiments performed in current-driven nano-contacts with strong perpendicular anisotropy have shown that spin-transfer torque can drive self-localized spin waves [1, 2] that above a certain threshold intensity can condense into a…

Mesoscale and Nanoscale Physics · Physics 2017-01-11 D. Xiao , V. Tiberkevich , Y. H. Liu , Y. W. Liu , S. M. Mohseni , S. Chung , M. Ahlberg , A. N. Slavin , J. Åkerman , Yan Zhou

Magnetic droplet soliton is a localized dynamic spin state which can serve as a nanoscale information carrier and nonlinear oscillator. The present opinion is that the formation of droplet solitons requires the compensation of magnetic…

Materials Science · Physics 2022-09-07 Andrei I. Nikitchenko , Nikolay A. Pertsev

Time-resolved coherent X-ray diffraction is used to measure the spatially resolved magnetization structure within FePt nanoparticles during laser-induced ultrafast demagnetization. The momentum-dependent X-ray magnetic diffraction shows…

We demonstrate that a spin current flowing through a nano-contact into a uniaxial antiferromagnet with first- and second-order anisotropy can excite a self-localized dynamic magnetic soliton, known as a spin-wave droplet in ferromagnets.…

Mesoscale and Nanoscale Physics · Physics 2024-06-14 Roman V. Ovcharov , Mohammad Hamdi , Boris A. Ivanov , Johan Åkerman , Roman S. Khymyn

We present an experimental investigation of radial spin-wave modes in magnetic nano-disks with a vortex ground state. The spin-wave amplitude was measured using a frequency-resolved magneto optical network analyzer, allowing for…

Mesoscale and Nanoscale Physics · Physics 2015-06-23 M. Helsen , A. Gangwar , J. De Clercq , A. Vansteenkiste , B. Van Waeyenberge

The prediction and realization of magnetic excitations driven by electrical currents via the spin transfer torque effect, enables novel magnetic nano-devices where spin-waves can be used to process and store information. The functional…

Mesoscale and Nanoscale Physics · Physics 2016-08-09 S. Bonetti , R. Kukreja , Z. Chen , F. Macià , J. M. Hernàndez , A. Eklund , D. Backes , J. Frisch , J. Katine , G. Malm , S. Urazhdin , A. D. Kent , J. Stöhr , H. Ohldag , H. A. Dürr

The propagation and controlled manipulation of strongly nonlinear, two-dimensional solitonic states in a thin, anisotropic ferromagnet are theoretically demonstrated. It has been recently proposed that spin-polarized currents in a…

Pattern Formation and Solitons · Physics 2012-07-23 M. A. Hoefer , M. Sommacal , T. J. Silva

In the field of femtomagnetism magnetic matter is controlled by ultrafast laser pulses; here we show that coupling phonon excitations of the nuclei to spin and charge leads to femto-phono-magnetism, a powerful route to control magnetic…

Materials Science · Physics 2022-03-29 S. Sharma , S. Shallcross , P. Elliott , J. K. Dewhurst

Ultrafast all-optical control of spins with femtosecond laser pulses is one of the hot topics at the crossroads of photonics and magnetism with a direct impact on future magnetic recording. Unveiling light-assisted recording mechanisms for…

Magnetic thin films with perpendicular magnetic anisotropy (PMA) have localized excitations that correspond to reversed dynamically precessing magnetic moments, known as magnetic droplet solitons. Fundamentally, these excitations are…

Materials Science · Physics 2015-04-08 Ferran Macià , Dirk Backes , Andrew D. Kent

Light-matter interaction at the nanoscale in magnetic alloys and heterostructures is a topic of intense research in view of potential applications in high-density magnetic recording. While the element-specific dynamics of electron spins is…

The magnetic droplet soliton is a large amplitude, coherently precessing wave state that exists in ferromagnetic thin films with perpendicular magnetic anisotropy. To effectively sustain a droplet, magnetic damping can be locally…

Pattern Formation and Solitons · Physics 2019-07-10 Richard O. Moore , Mark A. Hoefer

We predict theoretically that stable subwavelength plasmonic lattice solitons (PLSs) are formed in arrays of metallic nanowires embedded in a nonlinear medium. The tight confinement of the guiding modes of the metallic nanowires, combined…

Optics · Physics 2015-05-18 Fangwei Ye , Dumitru Mihalache , Bambi Hu , Nicolae C Panoiu

Magnetic droplet solitons are dynamical magnetic textures that form due to an attractive interaction between spin waves in thin films with perpendicular magnetic anisotropy. Spin currents and the spin torques associated with these currents…

Mesoscale and Nanoscale Physics · Physics 2020-09-10 Ferran Macià , Andrew D. Kent

It is clarified for the first time that solitons originating from the dipolar interaction in ferromagnetic nano-particle arrays are stably created. The characteristics can be well controlled by the strength of the dipolar interaction…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Satoshi Ishizaka , Kazuo Nakamura

We have studied the magnetic behavior of dextran-coated magnetite (Fe$_3$O$_4$) nanoparticles with median particle size $\left<d\right>=8$ $nm$. Magnetization curves and in-field M\"ossbauer spectroscopy measurements showed that the…

Materials Science · Physics 2007-05-23 E. Lima , A. L. Brandl , A. D. Arelaro , G. F. Goya

We use ultrafast x-ray and electron diffraction to disentangle spin-lattice coupling of granular FePt in the time domain. The reduced dimensionality of single-crystalline FePt nanoparticles leads to strong coupling of magnetic order and a…

Spin waves in magnetic microresonators are at the core of modern magnonics. Here we demonstrate a new method of tunable excitation of different spin wave modes in magnetic microdisks by using a train of laser pulses coming at a repetition…

Magnetic dissipative droplets are localized, strongly nonlinear dynamical modes excited in nano-contact spin valves with perpendicular magnetic anisotropy. These modes find potential application in nanoscale structures for magnetic storage…

Mesoscale and Nanoscale Physics · Physics 2015-06-17 Ezio Iacocca , Randy K. Dumas , Lake Bookman , Majid Mohseni , Sunjae Chung , Mark A. Hoefer , Johan Åkerman

Nanoscale miniaturization has revolutionized the field of spintronics by enabling exponential growth in areal bit density. A similar leap is also expected in device speeds through successfully harnessing femtosecond magnetization dynamics.…

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