Heat assisted spin torque switching of quasistable nanomagnets across a vacuum gap

Herzog, G.; Krause, Stefan; Wiesendanger, R.

doi:10.1063/1.3354023

Cited by 30 publications

(26 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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. [20][21][22][23][24] A similar process has been observed and modeled recently on adsorbed antiferromagnetic chains: The switch between the two Néel states of the chain can be induced by tunneling electrons from an STM tip. 25,26 These works open the way toward the fascinating possibility of controlling the magnetization of small objects at surfaces.…”

Section: Introductionmentioning

confidence: 85%

“…Magnetization reversal induced by tunneling current (tunneling current-induced changes in the thermal magnetization reversal) has been evidenced in several experimental studies, [20][21][22][23] and the importance of spin-transfer torque in this case has been put forward. The previous discussion was based at 0 K. However, the processes discussed for tunneling electrons should play a role in the case of thermal processes; indeed, substrate electrons above a certain energy can excite spin waves in the chain and lead to reversal, similar to tunneling electrons.…”

Section: Magnetization Switch Induced By Injected Electronsmentioning

confidence: 99%

“…25,26 These works open the way toward the fascinating possibility of controlling the magnetization of small objects at surfaces. Various processes have been proposed and discussed for the electron-induced magnetic reversal: [20][21][22][23][24] spin-transfer torque (the incident electron brings spin momentum to the object), Joule heating (the injected electrons locally heat the object, speeding up thermal reversal), and the Oerstedt field effect (the injected electron current generates a magnetic field that can influence the reversal), all possibly associated with quantum tunneling.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Section: Introductionmentioning

confidence: 85%

Section: Magnetization Switch Induced By Injected Electronsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic reversal of a quantum nanoferromagnet

Gauyacq

Lorente

2013

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…7c, top). In addition to a pure read-out, the magnetic state of nanostructures can also be manipulated: at high spin-polarized tunnel currents (on the order of mA) the spin-torque transfer from tunneling electrons can switch an individual island, similar to an applied external field, as sketched in Figure 7c bottom and demonstrated experimentally for Fe ML islands on W(110) Herzog et al, 2010).…”

Section: Data Analysis and Initial Interpretationmentioning

confidence: 98%

Magnetic Sensitive Scanning Tunneling Microscopy

Bergmann¹,

Kubetzka²

2012

Characterization of Materials

View full text Add to dashboard Cite

The scanning tunneling microscope is capable of studying magnetism at surfaces down to the atomic scale. Using spin‐polarized tips even complex magnetic ground states of surfaces and nanostructures can be revealed. The technique of spinpolarized scanning tunneling microscopy can also be applied to study the switching of individual (super)paramagnetic objects as a function of temperature or magnetic field and recently it has been shown that the magnetic state of nanoscale objects can also be manipulated. In addition one can study magnetic excitations by employing spin excitation spectroscopy and thereby deduce the spin, the anisotropy, the type and strength of magnetic coupling and even relaxation times of single atoms or small clusters. Combining these techniques with atom manipulation provides access to fundamental magnetic phenomena on the atomic scale.

show abstract

“…Moreover, the combination of single-atom manipulation techniques and single-atom magnetometry has led to the first demonstration of atomic-scale spin logic devices based solely on spin rather than charge transport for realizing computation and information transmission at the atomic level [17]. On the other hand, the combination of spin state readout and spin state manipulation, based on spin current-induced switching across a vacuum gap by means of SP-STM [18,19], provides a fascinating novel type of approach toward ultrahigh density magnetic recording without the use of magnetic stray fields.…”

mentioning

confidence: 99%

Atomic-Scale Spintronics

Brede

Chilian

Khajetoorians

et al. 2013

Handbook of Spintronics

View full text Add to dashboard Cite

The developments of novel spintronic materials and spin-based electronic devices are hot topics of current research in materials science and solid-state physics. Both research fields could profit tremendously from atomic-scale insight into magnetic properties and spin-dependent interactions at the atomic level. Based on the development of spin-polarized scanning tunneling microscopy (SP-STM), the novel method of single-atom magnetometry has recently been established. It allows the measurement of magnetization curves and the determination of magnetic moments on an atom-by-atom basis. While the sensitivity level of single-atom magnetometry is below one Bohr magneton, it can easily be combined with the atomic-resolution imaging and manipulation capabilities of conventional STM, thereby offering a novel approach toward a rational material design based on the knowledge of the atomic-level properties and interactions within the solid state. Moreover, an atom-by-atom design and realization of all-spin logic devices has recently been demonstrated based on the combined knowledge derived from surface physics, nanoscience, and magnetism.

show abstract

Heat assisted spin torque switching of quasistable nanomagnets across a vacuum gap

Cited by 30 publications

References 13 publications

Magnetic reversal of a quantum nanoferromagnet

Magnetic reversal of a quantum nanoferromagnet

Magnetic Sensitive Scanning Tunneling Microscopy

Atomic-Scale Spintronics

Contact Info

Product

Resources

About