Spin-Wave-Assisted Thermal Reversal of Epitaxial Perpendicular Magnetic Nanodots

Rohart, Stanislas; Campiglio, Paolo; Repain, Vincent; Nahas, Y.; Chacon, Cyril; Girard, Yann; Lagoute, Jérôme; Thiaville, A.; Rousset, Sylvie

doi:10.1103/physrevlett.104.137202

Cited by 32 publications

(31 citation statements)

References 20 publications

(28 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two size and anisotropy distributions have been considered; see Figs The perpendicular magnetic anisotropy energy of 1 AL high clusters is considerably larger than the ones reported for 2-AL-high Co islands with comparable size grown on Au(111) and Au(788). The reported values include the shape anisotropy and are K = 0.25-0.42 meV/atom [32], 0.3 meV/atom [33] on Au(111), and K = 0.22 ± 0.19 meV/atom [29], 0.37 ± 0.04 meV/atom [5] on Au(788). Therefore the MAE of 1-AL islands on GdAu 2 /Au(111) is significantly larger than the one of 2-AL Co islands grown on Au(111) and Au(788).…”

Section: B Below the Coalescence Thresholdmentioning

confidence: 99%

Magnetism and morphology of Co nanocluster superlattices onGdAu2/Au(111)–(13×13)

Cavallin

Fernández

Ilyn³

et al. 2014

Phys. Rev. B

View full text Add to dashboard Cite

We present a comprehensive study of the magnetism and morphology of an ultrahigh density array of Co nanoclusters self-assembled on the single atomic layer GdAu 2 on Au(111) template surface. Combining scanning tunneling microscopy, x-ray magnetic circular dichroism, and magneto-optical Kerr effect measurements, we reveal a significant enhancement of the perpendicular magnetic anisotropy energy for noncoalesced single atomic layer nanoclusters compared to Co/Au(111). For coverages well beyond the onset of coalescence, we observe room-temperature in-plane magnetic remanence.

show abstract

Section: B Below the Coalescence Thresholdmentioning

confidence: 99%

Magnetism and morphology of Co nanocluster superlattices onGdAu2/Au(111)–(13×13)

Cavallin

Fernández

Ilyn³

et al. 2014

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Spin-wave excitation has already been shown to play a significant role in magnetic reversal in several theoretical works using classical approaches. 9,15,16 Finally, one can also examine the effect of injecting electrons with a nonpolarized spin. In that case, for asymptotically long times, the system is not entirely in the ground state.…”

Section: Magnetization Switch Induced By Injected Electronsmentioning

confidence: 99%

“…The development of spin-polarized scanning tunneling microscopy (SP-STM) led to detailed observations of the thermally induced magnetic switch in small ferromagnets, allowing a detailed test of the global rotation of the Néel-Brown view and of its limits. [3][4][5][6][7][8][9][10] In parallel, analyses led to the discussion of other views of the thermally activated magnetization switch, [10][11][12][13][14][15][16][17] for example, spin-wave contributions, nucleation, edge effects, and anisotropy effect. Following earlier works on multilayered materials, 18,19 SP-STM experiments revealed that injection of spin-polarized electrons into a nanoferromagnet could also switch its magnetization.…”

Section: Introductionmentioning

confidence: 99%

Magnetic reversal of a quantum nanoferromagnet

Gauyacq

Lorente

2013

Phys. Rev. B

View full text Add to dashboard Cite

When the external magnetic field applied to a ferromagnetically coupled atomic chain is reversed suddenly, the magnetization of the chain switches, due to the reversal of all the atomic magnetic moments in the chain. The quantum processes underlying the magnetization switching and the time required for the switching are analyzed for model magnetic chains adsorbed on a surface at 0 K. The sudden field reversal brings the chain into an excited state that relaxes towards the system ground state via interactions with the substrate electrons. Different mechanisms are outlined, ranging from the global stepwise rotation of the chain macrospin induced by spin-flip collisions with substrate electrons in the pure Heisenberg chain (Néel-Brown process) to a correlation-mediated direct switching process in the presence of strong magnetic anisotropies in short chains (the global spin of the chain reverses in a single electron interaction). The processes for magnetization switching induced by electrons tunneling from a scanning tunneling microscope tip are also analyzed.

show abstract

“…In all of these applications a crucial role is played by spin waves. They also have a significant influence on the stability of the magnetic configuration [29,30], even if the system is smaller than the characteristic exchange length [31]. Because of their importance spin wave excitations in magnetic dots have been widely studied in numerous papers experimentally [32][33][34][35][36][37], theoretically [38][39][40][41][42][43], and by means of numerical simulations [44][45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Vortices in two-dimensional nanorings studied by means of the dynamical matrix method

Mamica

2015

Low Temperature Physics

View full text Add to dashboard Cite

This paper concerns an investigation of the spin wave excitations in magnetic nanoparticles. We provide a detailed derivation of the theoretical method for the determination of the normal modes of confined magnetic systems based on a discrete lattice of magnetic moments. The method is based on the damping-free Landau-Lifshitz equation and general enough to be utilized for the magnetic system of any dimensionality, magnetic structure, shape, and size. As an example we explore the influence of the competition between exchange and dipolar interactions on the spectrum of normal modes as well as on the stability of the vortex state in two-dimensional nanorings. We show the lowest-frequency mode to be indicative of the dipolar-to-exchange iterations ratio. We also study behavior of the fundamental mode and present the influence of both, the discreteness of the lattice and the dipolar-to-exchange iterations ratio, on its hybridization with azimuthal modes. We complete the paper with a selective review of the spin wave excitations in circular dots to compare with the results obtained for the rings. PACS: 75.10.Hk Classical spin models; 75.75.Jn Dynamics of magnetic nanoparticles; 73.90.+f Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures.

show abstract

Spin-Wave-Assisted Thermal Reversal of Epitaxial Perpendicular Magnetic Nanodots

Cited by 32 publications

References 20 publications

Magnetism and morphology of Co nanocluster superlattices onGdAu2/Au(111)–(13×13)

Magnetism and morphology of Co nanocluster superlattices onGdAu2/Au(111)–(13×13)

Magnetic reversal of a quantum nanoferromagnet

Vortices in two-dimensional nanorings studied by means of the dynamical matrix method

Contact Info

Product

Resources

About