Spin-transfer phenomena in layered magnetic structures: Physical phenomena and materials aspects

Grünberg, P.; Bürgler, D. E.; Dassow, H.; Rata, A. D.; Schneider, Claus M.

doi:10.1016/j.actamat.2006.10.002

Cited by 27 publications

(14 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(b) Another factor is that more energy may be dissipated due to the hollow structure; in this case spin-transfer effects may exist due to the interlayer exchange coupling. 22 (c) HCNFs around the hollow structure are composed of many small graphene sheets or carbon clusters, such as amorphous carbon nanotubes, which exhibit the features of short-range order and long-range disorder. These special features favor higher performance of electromagnetic wave absorbing properties.…”

Section: View Article Onlinementioning

confidence: 99%

See 1 more Smart Citation

Remarkable improvement in microwave absorption by cloaking a micro-scaled tetrapod hollow with helical carbon nanofibers

Jian

Chen

Zhou

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Helical nanofibers are prepared through in situ growth on the surface of a tetrapod-shaped ZnO whisker (T-ZnO), by employing a precursor decomposition method then adding substrate. After heat treatment at 900 1C under argon, this new composite material, named helical nanofiber-T-ZnO, undergoes a significant change in morphology and structure. The T-ZnO transforms from a solid tetrapod ZnO to a micro-scaled tetrapod hollow carbon film by reduction of the organic fiber at 900 1C. Besides, helical carbon nanofibers, generated from the carbonization of helical nanofibers, maintain the helical morphology. Interestingly, HCNFs with the T-hollow exhibit remarkable improvement in electromagnetic wave loss compared with the pure helical nanofibers. The enhanced loss ability may arise from the efficient dielectric friction, interface effect in the complex nanostructures and the micro-scaled tetrapod-hollow structure.

show abstract

Section: View Article Onlinementioning

confidence: 99%

“…21 Pores in the micro-spheres also increase specimen microwave loss due to spin-transfer effects. 22 So, it is valuable to design novel multi-scale structures or those with different morphologies such as grain size, porosity and intra-or intergranular pores, etc.…”

Section: Introductionmentioning

confidence: 99%

Remarkable improvement in microwave absorption by cloaking a micro-scaled tetrapod hollow with helical carbon nanofibers

Jian

Chen

Zhou

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…[13][14][15] The spin polarized current is also investigated with quantum dot, [16][17][18][19][20][21] magnetic semiconductor quantum-well 22,23 and magnetic multilayer-tunnel-junction. [24][25][26][27][28][29] As a back action the SMM can be also manipulated by the spin-polarized current, which affects the magnetization orientation of the SMM via the spin exchange interaction between electron spin and molecule giant-spin. 30,31 The spin polarized current applies a so-called spin-transfer-torque 24,25,32,33 (STT) to rotate the anisotropy easy-axis of the SMM.…”

Section: Introductionmentioning

confidence: 99%

“…[24][25][26][27][28][29] As a back action the SMM can be also manipulated by the spin-polarized current, which affects the magnetization orientation of the SMM via the spin exchange interaction between electron spin and molecule giant-spin. 30,31 The spin polarized current applies a so-called spin-transfer-torque 24,25,32,33 (STT) to rotate the anisotropy easy-axis of the SMM. [34][35][36][37] Recently, various quantum devices were developed based on STT, such as magnetic random-access memories, nano-oscillators and quantum dots etc.…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium quantum transport of spin-polarized electrons and back action on molecular magnet tunnel-junction

et al. 2016

View full text Add to dashboard Cite

We investigate the non-equilibrium quantum transport through a single-molecule magnet embedded in a tunnel junction with ferromagnetic electrodes, which generate spin-polarized electrons. The lead magnetization direction is non-collinear with the uniaxial anisotropy easy-axis of molecule-magnet. Based on the Pauli rate-equation approach we demonstrate the magnetization reversion of molecule-magnet induced by the back action of spin-polarized current in the sequential tunnel regime. The asymptotic magnetization of molecular magnet and spin-polarization of transport current are obtained as functions of time by means of time-dependent solution of the rate equation. It is found that the antiparallel configuration of the ferromagnetic electrodes and molecular anisotropy easy-axis is an effective structure to reverse both the magnetization of molecule-magnet and spin-polarization of the transport current. Particularly the non-collinear angle dependence provides useful knowledge for the quantum manipulation of molecule-magnet and spin polarized electron-transport.

show abstract

“…Thin layers with thicknesses in the range of a few nanometers and multilayers thereof feature new physical phenomena that are not present in bulk samples 1 . In many cases these phenomena crucially depend on the properties of the inevitable interfaces with the substrate and between individual layers.…”

mentioning

confidence: 99%

Hard x-ray photoemission using standing-wave excitation applied to the MgO/Fe interface

et al. 2011

View full text Add to dashboard Cite

Many applications in electronics and spintronics rely on interfaces, which are buried a few nanometers deep and thus hardly accessible in real devices except for invasive techniques. Here, we report on hard x-ray photoemission spectroscopy combined with the x-ray standing-wave technique as a non-invasive method to access buried interfaces with a depth resolution of a fewÅ and enhanced interface sensitivity. Within these experiments, the film thicknesses and also the thicknesses of the intermixing layers are determined. We extend the data analysis scheme previously developed for soft x-rays to the hard x-ray regime and apply the method to buried epitaxial Fe/MgO interfaces, which play a crucial role in magnetic tunnel junctions and their applications. It was found that there was no detectable intermixing of reaction of the Fe and MgO layers at the interface.

show abstract

Spin-transfer phenomena in layered magnetic structures: Physical phenomena and materials aspects

Cited by 27 publications

References 41 publications

Remarkable improvement in microwave absorption by cloaking a micro-scaled tetrapod hollow with helical carbon nanofibers

Remarkable improvement in microwave absorption by cloaking a micro-scaled tetrapod hollow with helical carbon nanofibers

Non-equilibrium quantum transport of spin-polarized electrons and back action on molecular magnet tunnel-junction

Hard x-ray photoemission using standing-wave excitation applied to the MgO/Fe interface

Contact Info

Product

Resources

About