Current-Induced Microwave Excitation of a Domain Wall Pinned in a Magnetic Wire with Bi-Axial Anisotropy

Matsushita, Katsuyoshi; Sato, Jun; Imamura, Hiroshi

doi:10.1143/jpsj.78.093801

Cited by 10 publications

(12 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(3) (See Refs. [16][17][18][19] ). This naturally derived breathing of the DW has not been much discussed experimentally, because of difficulty to build observation technique.…”

Section: Oscillation and Breathing Mode Of Magnetic Domain Wallmentioning

confidence: 99%

“…In addition to the oscillation, a vibration of a width of the DW called "breathing mode" is expected, since this solitonic object is composed of many electron spins. In the previous theoretical studies [16][17][18][19] , the breathing mode induced by the electric current has been discussed. A currentdriven breathing mode is expected to be a microwave source of wireless telecommunication devices 18,19 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Possible method to observe the breathing mode of a magnetic domain wall in the Josephson junction

Mori¹,

Koshibae²,

Hikino³

et al. 2014

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

A magnetic domain wall (DW) behaves as a massive particle with elasticity. Sliding and oscillation of the DW have been observed experimentally, whereas vibration of a width in the DW, "breathing mode", has not been measured so far. We theoretically propose how to observe the breathing mode by the Josephson junction having a ferromagnetic layer between superconducting electrodes. The current-voltage (I-V ) curve is calculated by an equivalent circuit of the resistively shunted junction model. The breathing mode is identified by stepwise structures in the I-V curve, which appear at the voltages V = n( /2e)ω with the fundamental constant /e, integer number n, and the frequency of the breathing mode ω.

show abstract

“…(3) (See Refs. [16][17][18][19] ). This naturally derived breathing of the DW has not been much discussed experimentally, because of difficulty to build observation technique.…”

Section: Oscillation and Breathing Mode Of Magnetic Domain Wallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Possible method to observe the breathing mode of a magnetic domain wall in the Josephson junction

Mori¹,

Koshibae²,

Hikino³

et al. 2014

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…To calculate the MR for a given configuration {S i } in the procedure (ii), we use the continuity equatioñ r Áj e ¼ 0; (6) and the Zhang-Levy-Fert diffusion equations 40 for the stationary state …”

Section: B Mr Measurementmentioning

confidence: 99%

“…2 One of the magnetoresistance (MR) elements in small read heads is the domain-wall spin valve. [3][4][5][6][7][8][9] The domain-wall spin valve consists of a magnetic metal nano-constriction between magnetic metal free and fixed layers as shown in Fig. 1(a).…”

mentioning

confidence: 99%

Thermal stability of the geometrically constrained magnetic wall and its effect on a domain-wall spin valve

Sasaki

Matsushita

Sato

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

We studied thermal fluctuations in magnetoresistance (MR) signals originating from geometrically confined magnetic walls (GCMWs) of nanometer size. To this end, we developed a novel numerical simulation method which quantitatively evaluates the magnitude of thermal fluctuations in MR signals of magnetic nanostructures. Using the method, we first investigated the case when the twist angle Θ between the magnetization in a fixed layer and that in a free layer is 180°. We found that the thermal fluctuations of the magnetic structure of the 180° GCMW do not induce any crucial fluctuations in the MR signal because there is no significant difference among the MR values of the magnetic structures caused by the thermal fluctuations. We next investigated the dependence on the twist angle Θ of thermal fluctuations in MR signals. Since the GCMW is stabilized by decreasing Θ from 180°, the standard deviation (SD) of the MR signal is reduced with decreasing Θ. On the contrary, the SD/M ratio (M is the mean of the MR signal) monotonically increases with decreasing Θ because the attenuation of the mean value of MR is faster than that of the standard deviation. We also found that the SD/M ratio was not large for any of the temperatures (from 300 to 600 K) and twist angles (from 90° to 180°) we examined. The maximum value of the ratio, which was obtained when T = 600 K and Θ = 90°, was about 13%. This result indicates that thermal fluctuations do not cause significant noise in MR devices that utilize GCMWs of nanometer size.

show abstract

“…The energy of the top electrode E T and the boundary angle θ 0 of the ground state of the Néel wall are calculated from Eqs. (9) and (11), respectively, by changing the length for the normalization from ℓ to ℓ eff .…”

mentioning

confidence: 99%

Penetration of a Magnetic Wall into Thin Ferromagnetic Electrodes of a Nano-Contact Spin Valve

et al. 2013

Self Cite

View full text Add to dashboard Cite

We theoretically analyzed a magnetic wall confined in a nano-contact spin valve paying special attention to the penetration of the magnetic wall into thin ferromagnetic electrodes. We showed that, compared with the Bloch wall, the penetration of the Néel wall is suppressed by increases of the demagnetization energy. We found the optimal conditions of the radius and height of the nano-contact to maximize the power of the current-induced oscillation of the magnetic wall. We also found that the thermal stability of the Bloch wall increases when the nano-contact's radius increases or height decreases.

show abstract

Current-Induced Microwave Excitation of a Domain Wall Pinned in a Magnetic Wire with Bi-Axial Anisotropy

Cited by 10 publications

References 37 publications

Possible method to observe the breathing mode of a magnetic domain wall in the Josephson junction

Possible method to observe the breathing mode of a magnetic domain wall in the Josephson junction

Thermal stability of the geometrically constrained magnetic wall and its effect on a domain-wall spin valve

Penetration of a Magnetic Wall into Thin Ferromagnetic Electrodes of a Nano-Contact Spin Valve

Contact Info

Product

Resources

About