Nonequilibrium sub-10 nm spin-wave soliton formation in FePt nanoparticles.
Diego TurenneAlexander A YaroslavtsevXiaocui WangVivek UnikandanuniIgor VaskivskyiMichael SchneiderEmmanuelle JalRobert E CarleyGiuseppe MercurioRafael GortNaman AgarwalBenjamin Van KuikenLaurent MercadierJustine SchlappaLoïc Le GuyaderNatalia GerasimovaMartin TeichmannDavid LomidzeAndrea CastoldiDimitri PotorochinDeepak John MukkattukavilJeffrey A BrockNanna Zhou HagströmAlexander H M ReidXiaozhe ShenXijie J WangPablo MaldonadoYaroslav KvashninKarel CarvaJian WangYukiko K TakahashiEric E FullertonStefan EisebittPeter M OppeneerSerguei MolodtsovAndreas ScherzStefano BonettiEzio IacoccaHermann A DürrPublished in: Science advances (2022)
Magnetic nanoparticles such as FePt in the L1 0 phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magnetocrystalline anisotropy. This, in turn, reduces the magnetic exchange length to just a few nanometers, enabling magnetic structures to be induced within the nanoparticles. Here, we describe the existence of spin-wave solitons, dynamic localized bound states of spin-wave excitations, in FePt nanoparticles. We show with time-resolved x-ray diffraction and micromagnetic modeling that spin-wave solitons of sub-10 nm sizes form out of the demagnetized state following femtosecond laser excitation. The measured soliton spin precession frequency of 0.1 THz positions this system as a platform to develop novel miniature devices.
Keyphrases
- room temperature
- density functional theory
- single molecule
- transition metal
- magnetic nanoparticles
- high resolution
- photodynamic therapy
- electronic health record
- computed tomography
- magnetic resonance imaging
- high glucose
- sensitive detection
- oxidative stress
- magnetic resonance
- walled carbon nanotubes
- mass spectrometry
- fluorescent probe
- drug induced
- data analysis
- crystal structure
- energy transfer