Analytic expression of the temperature increment in a spin transfer torque nanopillar structure

You, Chun‐Yeol; Ha, Seung-Seok; Lee, Hyun Woo

doi:10.1016/j.jmmm.2009.06.076

Cited by 14 publications

(6 citation statements)

References 30 publications

(45 reference statements)

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“…2(c,d) are performed at T = 60 K in order to produce a broadening of the switching bands similar to that seen in the experimental data. Estimates of Joule heating in similar structures 18 suggests a maximum temperature increase of around 30 K, implying that some of the experimentally observed broadening is micromagnetic in nature. Comparing constant pulse-amplitude slices of the simulated and experimental phase diagrams, as shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

A cryogenic spin-torque memory element with precessional magnetization dynamics

Rowlands

Ryan

et al. 2019

Sci Rep

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We present a study of precessional magnetization switching in orthogonal spin-torque spin-valve devices at low temperatures. The samples consist of a spin-polarizing layer that is magnetized out-of-the film plane and an in-plane magnetized free and reference magnetic layer separated by non-magnetic metallic layers. We find coherent oscillations in the switching probability, characterized by high speed switching (~200 ps), error rates as low as 10−5 and decoherence effects at longer timescales (~1 ns). Our study, which is conducted over a wide range of parameter space (pulse amplitude and duration) with deep statistics, demonstrates that the switching dynamics are likely dominated by the action of the out-of-plane spin polarization, in contrast to in-plane spin-torque from the reference layer, as has been the case in most previous studies. Our results demonstrate that precessional spin-torque devices are well suited to a cryogenic environment, while at room temperature they have so far not exhibited coherent or reliable switching.

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Section: Resultsmentioning

confidence: 93%

A cryogenic spin-torque memory element with precessional magnetization dynamics

Rowlands

Ryan

et al. 2019

Sci Rep

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“…The frequency shift is a linear function of the temperature for small variation of temperature or M s , 19 and the temperature increment of MTJ is proportional to the square of current. 22 Thus, the frequency shift due to the Joule heating is a quadratic function of the bias voltage. On the other hand, another possible origin is the Oersted field created by a running current.…”

Section: Resultsmentioning

confidence: 99%

Bias dependences of in-plane and out-of-plane spin-transfer torques in symmetric MgO-based magnetic tunnel junctions

et al. 2010

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We investigate the bias dependences of in-plane and out-of-plane spin-transfer torque by employing magnetic noise measurement in symmetric MgO-based magnetic tunneling junction devices. The measured power spectra densities of magnetic noise are successfully analyzed by the fluctuation-dissipation theorem with an imaginary part of transverse susceptibility including spin-transfer torque contributions. We find that the inplane component has a linear dependence of the bias voltage, while the out-of-plane component has a quadratic dependence. These results are well consistent with the noise amplitude analysis, neglecting the Joule heating effect with small bias voltage.

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“…Again both the CIMS [21,23,26] and CIMP [22] have been demonstrated. Various details of STT physics are under active investigation [31][32][33][34][35][36] and a range of extensions are being explored [37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Spin Transfer Torque in Ferromagnet-Normal Metal-Antiferromagnet Junctions

Lee¹,

Yang²

2011

Journal of Magnetics

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This study investigated theoretically the properties of the spin transfer torque acting on a ferromagnet in a ferromagnet-normal metal-antiferromagnet junction. Earlier work showed that the angular dependence of the spin transfer torque can be a wavy-type if the junction satisfies a special symmetry. This paper reports a simple model analysis that allows a derivation of the wavy angular dependence without taking advantage of the symmetry. This result suggests that the wavy angular dependence can appear even when the symmetry is broken. As an illustration, the angular dependence was calculated as a function of the degree of the compensation at the normal metal-antiferromagnet interface. The implications of the result for the current-induced magnetization precession are discussed.

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Analytic expression of the temperature increment in a spin transfer torque nanopillar structure

Cited by 14 publications

References 30 publications

A cryogenic spin-torque memory element with precessional magnetization dynamics

A cryogenic spin-torque memory element with precessional magnetization dynamics

Bias dependences of in-plane and out-of-plane spin-transfer torques in symmetric MgO-based magnetic tunnel junctions

Spin Transfer Torque in Ferromagnet-Normal Metal-Antiferromagnet Junctions

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