Controlling the speed at which systems evolve is a challenge shared by all disciplines, and otherwise unrelated areas use common theoretical frameworks towards this goal. A particularly widespread model is Glauber dynamics1, which describes the time evolution of the Ising model and can be applied to any binary system2, 3, 4, 5, 6, 7. Here we show, using molecular nanowires under irradiation, that Glauber dynamics can be controlled by a novel domain-wall kickoff mechanism. In contrast to known processes, the kickoff has unambiguous fingerprints, slowing down the spin-flip attempt rate by several orders of magnitude, and following a scaling law. The required irradiance is very low, a substantial improvement over present methods of magneto-optical switching8, 9. These results provide a new way to control and study stochastic dynamic processes. Being general for Glauber dynamics, they can be extended to different kinds of magnetic nanowires and to numerous fields, ranging from social evolution2 to neural networks5 and chemical reactivity3, 4.
At a glance
- Time-dependent statistics of the Ising model. J. Math. Phys. 4, 294–307 (1963).
- Statistical physics of social dynamics. Rev. Mod. Phys. 81, 591–646 (2009). , &
- Kinetic Ising model for polymer dynamics: Applications to dielectric relaxation and dynamic depolarized light scattering. J. Chem. Phys. 79, 1955–1964 (1983).
- Dynamics of an Ising chain under local excitation: A scanning tunneling microscopy study of Si(100) dimer rows at 5 K. Phys. Rev. Lett. 96, 026102 (2006). , , , &
- Weak pairwise correlations imply strongly correlated network states in a neural population. Nature 440, 1007–1012 (2006). , , &
- 2007). , & Molecular Nanomagnets (Oxford Univ. Press,
- Single-chain magnets: Where to from here? J. Mater. Chem. 18, 4750–4758 (2008). , , &
- Explaining the paradoxical diversity of ultrafast laser-induced demagnetization. Nature Mater. 9, 259–265 (2009). et al.
- Ultrafast precessional magnetization reversal by picosecond magnetic field pulse shaping. Nature 418, 509–512 (2002). , , , &
- Current-induced switching of domains in magnetic multilayer devices. Science 285, 867–870 (1999). , , , &
- Multiferroic and magnetoelectric materials. Nature 442, 759–765 (2006). , &
- Electric-field control of ferromagnetism. Nature 408, 944–946 (2000). et al.
- Spin-light coherence for single-spin measurement and control in diamond. Science 330, 1212–1215 (2010). , , &
- Active magneto-plasmonics in hybrid metal–ferromagnet structures. Nature Photon. 4, 107–111 (2010). et al.
- Switching of magnetization by nonlinear resonance studied in single nanoparticles. Nature Mater. 2, 524–527 (2003). , &
- Anisotropic magneto-Coulomb effects and magnetic single-electron-transistor action in a single nanoparticle. Nature Phys. 5, 920–924 (2009). et al.
- Quantum nucleation in a single-chain magnet. Phys. Rev. Lett. 95, 237203 (2005). , , , &
- Molecular spintronics using single-molecule magnets. Nature Mater. 7, 179–186 (2008). &
- Quinonoid metal complexes: Toward molecular switches. Acc. Chem. Res. 37, 827–835 (2004). , , &
- Control of magnetic properties through external stimuli. Angew. Chem. Int. Ed. 46, 2152–2187 (2007). , &
- Cobalt(II)-nitronyl nitroxide chains as molecular magnetic nanowires. Angew. Chem. Int. Ed. 40, 1760–1763 (2001). et al.
- Finite-size effects in single chain magnets: An experimental and theoretical study. Phys. Rev. Lett. 92, 207204 (2004). et al.
- Static and dynamic properties of single-chain magnets with sharp and broad domain walls. Phys. Rev. B 84, 064415 (2011). , , &
- Dual chromophore-nitroxides: Novel molecular probes, photochemical and photophysical models and magnetic materials. Photochem. Photobiol. 83, 871–881 (2007). , &
- Picosecond excited-state dynamics in octahedral cobalt(III) complexes: Intersystem crossing versus internal conversion. Inorg. Chem. 32, 394–399 (1993). , , &
- Subatomic movements of a domain wall in the Peierls potential. Nature 426, 812–816 (2003). , , , &
- Magnetization processes in high anisotropy systems. J. Magn. Magn. Mater. 129, 79–86 (1994).
- Spin coupling in engineered atomic structures. Science 312, 1021–1024 (2006). , &
- Nanoscale magnetic sensing with an individual electronic spin in diamond. Nature 455, 644–647 (2008). et al.
- Kondo effect in single atom contacts: The importance of the atomic geometry. Phys. Rev. Lett. 101, 216802 (2008). et al.
- A.c. magnetization transport and power absorption in nonitinerant spin chains. Phys. Rev. Lett. 101, 017202 (2008). , &