Unified understanding of both thermally assisted and precessional spin-transfer switching in perpendicularly magnetized giant magnetoresistive nanopillars

Tomita, Hiroyuki; Miwa, Shinji; Nozaki, Takayuki; Nagase, T.; Nishiyama, K.; Kitagawa, E.; Yoshikawa, Masayuki; Daibou, T.; Nagamine, M.; Kishi, T.; Ikegawa, S.; Shimomura, N.; Yasuda, Hiroaki; Suzuki, Y.

doi:10.1063/1.4789879

Cited by 33 publications

(23 citation statements)

References 28 publications

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“…Depending on the magnitude of switching current, the switching behavior of MTJ can be divided into two regimes [16]: Sun model (I N I c0 ) [17] and Neel-Brown model (I b I c0 ) [18]. For PMA STT MTJ, these two regimes are isolated by the critical current which can be described by the following equations [2]:…”

Section: Temperature Dependence Of Critical Current I C0mentioning

confidence: 99%

Compact thermal modeling of spin transfer torque magnetic tunnel junction

Wang

Cai

Naviner

et al. 2015

Microelectronics Reliability

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Section: Temperature Dependence Of Critical Current I C0mentioning

confidence: 99%

Compact thermal modeling of spin transfer torque magnetic tunnel junction

Wang

Cai

Naviner

et al. 2015

Microelectronics Reliability

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“…Thermal activation mainly decreases the threshold current value and the switching time, introducing an undesirable stochastic magnitude effect in both parameters [16,17]. The influence of the writing pulse duration was also theoretically studied [16,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Respective influence of in-plane and out-of-plane spin-transfer torques in magnetization switching of perpendicular magnetic tunnel junctions

et al. 2015

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International audienceThe relative contributions of in-plane (damping-like) and out-of-plane (field-like) spin-transfer torques (STT) in the magnetization switching of out-of-plane magnetized magnetic tunnel junctions (pMTJ) has been theoretically analyzed using the transformed Landau-Lifshitz-Gilbert (LLG) equation with the STT terms. It is demonstrated that in a pMTJ structure obeying macrospin dynamics, the out-of-plane torque influences the precession frequency, but it does not contribute significantly to the STT switching process (in particular to the switching time and switching current density), which is mostly determined by the in-plane STT contribution. This conclusion is confirmed by finite temperature and finite writing pulse macrospin simulations of the current field switching diagrams. It contrasts with the case of STT switching in in-plane magnetized magnetic tunnel junction (MTJ) in which the field-like term also influences the switching critical current. This theoretical analysis was successfully applied to the interpretation of voltage field STT switching diagrams experimentally measured on pMTJ pillars 36 nm in diameter, which exhibit macrospin behavior. The physical nonequivalence of Landau and Gilbert dissipation terms in the presence of STT-induced dynamics is also discussed

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“…Depending on the magnitude of switching current, the stochastic behavior can also be divided into two regimes [14]: Sun model (I > I c0 ) [15] and Neel-brown model (I < I c0 ) [16,17]. The former is also called precessional switching which addresses fast switching (sub 3 ns) but consumes more energy with high current density.…”

Section: Stochastic Model Of Mtjmentioning

confidence: 98%