Mechanical magnetometry of Cobalt nanospheres deposited by focused electron beam at the tip of ultra-soft cantilevers

Lavenant, Hugo; Naletov, V. V.; Klein, O.; Loubens, G. de; Casado, L.; Teresa, José María de

doi:10.2478/nanofab-2014-0006

Cited by 25 publications

(29 citation statements)

References 42 publications

(68 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…When the cw microwave pumping excites the magnetization dynamics in the sample, its longitudinal component is reduced, so the static dipolar force with the magnetic probe diminishes. The associated variation of the cantilever frequency provides a quantitative magnetometry of the sample [47]. In order to improve the signal to noise ratio, the microwave excitation is pulsed on and off at f c .…”

Section: Discussionmentioning

confidence: 99%

Nutation Spectroscopy of a Nanomagnet Driven into Deeply Nonlinear Ferromagnetic Resonance

Naletov

Klein

et al. 2019

Phys. Rev. X

View full text Add to dashboard Cite

Strongly out-of-equilibrium regimes in magnetic nanostructures exhibit novel properties, linked to the nonlinear nature of magnetization dynamics, which are of great fundamental and practical interest. Here, we demonstrate that field-driven ferromagnetic resonance can occur with substantial spatial coherency at unprecedented large angle of magnetization precessions, which is normally prevented by the onset of spin-wave instabilities and magnetization turbulent dynamics. Our results show that this limitation can be overcome in nanomagnets, where the geometric confinement drastically reduces the density of spin-wave modes. The obtained deeply nonlinear ferromagnetic resonance regime is probed by a new spectroscopic technique based on the application of a second excitation field. This enables to resonantly drive slow coherent magnetization nutations around the large angle periodic trajectory. Our experimental findings are well accounted for by an analytical model derived for systems with uniaxial symmetry. They also provide new means for controlling highly nonlinear magnetization dynamics in nanostructures, which open interesting applicative opportunities in the context of magnetic nanotechnologies. Spectroscopy based on the resonant interaction of electromagnetic fields with material media has been of tremendous impact on the development of physics since the beginning of the 20th century and remains of crucial importance till nowadays in the study of nanotechnologies. In this area, a central role is played by magnetic resonance spectroscopy, which includes various techniques such as nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR), and ferromagnetic resonance (FMR), all based on the excitation of the Larmor precession of magnetic moments around their equilibrium position [1].FMR differs from NMR and EPR by the fact that in ferromagnetic media, magnetic moments are coupled by strong exchange interactions which tend to align them, leading to a large macroscopic spontaneous magnetization. In these conditions, magneto-dipolar effects become important and determine large internal fields which enrich both the ground state, that can be spatially non-uniform, and the dynamics of magnetic moments. The complex interactions taking place in the media can be described by an appropriate effective field which sets the time scale of the magnetization precession, and which itself depends on the magnetization, making the dynamics, for sufficiently large deviations from the ground state, highly nonlinear [2]. A special role in FMR is also played by the spin-waves (SWs), which are the collective eigenmodes associated to small magnetization oscillations around the equilibrium configuration [3]. When pumping fields excite SWs well above their thermal amplitudes, a rich variety of phenomena emerges, such as the formation of dynamical solitons [4,5], SW turbulences and chaos [4,[6][7][8], and Bose-Einstein condensation of magnons [9], the quanta of SWs.Recent developments in magnetic nanotechnologies have also demon...

show abstract

Section: Discussionmentioning

confidence: 99%

Nutation Spectroscopy of a Nanomagnet Driven into Deeply Nonlinear Ferromagnetic Resonance

Naletov

Klein

et al. 2019

Phys. Rev. X

View full text Add to dashboard Cite

show abstract

“…The fixing of the magnetic nanosphere at the cantilever tip is challenging, normally relying on manual procedures hard to reproduce. Chia et al [61] and Lavenant et al [62] have recently succeeded in directly growing cobalt nanostructures with shape close to nanospheres at the tip of such cantilevers. Chia et al [61] have used them to perform accurate detection of defective devices, whereas Lavenant et al [62] have so far characterized the magnetization of the cobalt nanospheres themselves.…”

Section: Ferromagnetic Resonance Force Microscopymentioning

confidence: 98%

“…Chia et al [61] and Lavenant et al [62] have recently succeeded in directly growing cobalt nanostructures with shape close to nanospheres at the tip of such cantilevers. Chia et al [61] have used them to perform accurate detection of defective devices, whereas Lavenant et al [62] have so far characterized the magnetization of the cobalt nanospheres themselves. They have found that cobalt nanospheres with diameter as small as 100 nm present relatively large magnetization values, 400 emu/cm 3 (about three times smaller than the bulk value).…”

Section: Ferromagnetic Resonance Force Microscopymentioning

confidence: 98%

Present and future applications of magnetic nanostructures grown by FEBID

Fernández-Pacheco

2014

Appl. Phys. A

View full text Add to dashboard Cite

“…1). Диаметр зонда со-ответствовал типичным размерам зондов, используемых в МРСМ [10,11], и составлял 200 nm. Исследовались колебания намагниченности образцов в переменном маг-нитном поле h величиной 0.1 mT, направленном в плос-кости образца вдоль оси y. В расчетах регистрировались временные зависимости установившихся колебаний всех компонент намагниченности [12].…”

Section: методика расчетовunclassified

Локализованные Моды Спин-Волнового Резонанса Ферромагнитных Микрополосок В Поле Магнитного Зонда

Gorev¹,

Миронов²

2017

Физика Твердого Тела

View full text Add to dashboard Cite

Приводятся результаты микромагнитного моделирования вынужденных колебаний намагниченности планарных микрополосок из NiFe с анизотропией легкая плоскость и из Co/Pt с перпендикулярной анизотропией типа легкая ось в поле магнитного сферического зонда. Показано, что под воздействием поля зонда в полосках NiFe реализуется связанное состояние "еж"-"антивихрь", обусловленное латеральными компонентами поля зонда, а в слое Co/Pt реализуется скирмионное состояние намагниченности. Эти эффекты приводят к искажению пространственных распределений колебаний намагниченности микрополосок и к появлению дополнительных резонансов в спектрах колебаний, связанных с модами, локализованными в поле зонда. Работа выполнена при поддержке Российского научного фонда (проект N 16-12-10254). DOI: 10.21883/FTT.2017.11.45053.10k

show abstract

Mechanical magnetometry of Cobalt nanospheres deposited by focused electron beam at the tip of ultra-soft cantilevers

Abstract: figure: SEM image of a 200 nm Co nanosphere grown at the tip of an ultra-soft cantilever by focus electron beam induced deposition.

Cited by 25 publications

References 42 publications

Nutation Spectroscopy of a Nanomagnet Driven into Deeply Nonlinear Ferromagnetic Resonance

Nutation Spectroscopy of a Nanomagnet Driven into Deeply Nonlinear Ferromagnetic Resonance

Present and future applications of magnetic nanostructures grown by FEBID

Локализованные Моды Спин-Волнового Резонанса Ферромагнитных Микрополосок В Поле Магнитного Зонда

Contact Info

Product

Resources

About