Spin transfer nano-oscillators

Zeng, Zhongming; Finocchio, G.; Jiang, Hong-Wen

doi:10.1039/c2nr33407k

Cited by 171 publications

(87 citation statements)

References 126 publications

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“…[2][3][4][5][6][7] The STOs are typically fabricated in two different architectures: Nano-pillar 1 or nanoscale electrical contacts (NC) 8 to ferromagnetic thin films with a free magnetic layer and a fixed spin polarizer layer. The spin-transfer torque (STT) in such contacts can compensate the damping torque and excite steady state spin precession in the free layer at a threshold d.c. current.…”

Section: Introductionmentioning

confidence: 99%

Phase-locking of multiple magnetic droplets by a microwave magnetic field

et al. 2017

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Manipulating dissipative magnetic droplet is of great interest for both the fundamental and technological reasons due to its potential applications in the high frequency spin-torque nano-oscillators. In this paper, a magnetic droplet pair localized in two identical or non-identical nano-contacts in a magnetic thin film with perpendicular anisotropy can phase-lock into a single resonance state by using an oscillating microwave magnetic field. This resonance state is a little away from the intrinsic precession frequency of the magnetic droplets. We found that the phase-locking frequency range increases with the increase of the microwave field strength. Furthermore, multiple droplets with a random initial phase can also be synchronized by a microwave field.

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Section: Introductionmentioning

confidence: 99%

Phase-locking of multiple magnetic droplets by a microwave magnetic field

et al. 2017

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“…[2] Typical MTJs are composed of electrodes with an inplane magnetization. [3,4] However, MTJs with perpendicular magnetic anisotropy (p-MTJs) have great advantages over the in-plane ones, due to their high tunnel magnetoresistance ratio (TMR), high thermal stability and low critical current for current induced magnetization switching.…”

Section: Introductionmentioning

confidence: 99%

MgO thickness-induced spin reorientation transition in Co0.9Fe0.1/MgO/Co0.9Fe0.1 structure

Lasek

Gładczuk

Sawicki

et al. 2017

Journal of Magnetism and Magnetic Materials

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The magnetic anisotropy (MA) of Mo/Au/Co 0.9 Fe 0.1 /Au/MgO(0.7 -3 nm)/Au/Co 0.9 Fe 0.1 /Au heterostructure has been investigated at room temperature as a function of MgO layer thickness (t MgO ). Our studies show that while the MA of the top layer does not change its character upon variation of t MgO , the uniaxial out-of-plane MA of the bottom one undergoes a spin reorientation transition at t MgO of about 0.8 nm, switching to the regime where the coexistence of in-and out-ofplane magnetization alignments is observed. The magnitudes of the magnetic anisotropy constants have been determined from ferromagnetic resonance and dc-magnetometry measurements. The origin of MA evolution has been attributed to a presence of an interlayer exchange coupling (IEC) between Co 0.9 Fe 0.1 layers through the thin MgO film.

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“…2 It exhibits high operating frequencies (over 100 GHz), low cost, and low power consumption, nonetheless it holds limited tunability (±20%). 3,4 Microwave spin-transfer-torque nano-oscillators (STNOs) 5,6,7,8 and spin-Hall oscillators (SHOs) 9,10,11,12 seem to be promising as solutions beyond VCOs that are also compatible with complementary-metal-oxide silicon (CMOS) technology.…”

mentioning

confidence: 99%

“…8,13 Other features are a better scalability (over 50 times smaller) and high quality factors, 14 they work in a broad range of temperatures and show intrinsic radiation hardness. On the other hand, the main weakness of STNOs and SHOs is the low output power (order of microwatts for the magnetic tunnel junction STNO).…”

mentioning

confidence: 99%

Scalable synchronization of spin-Hall oscillators in out-of-plane field

Puliafito

Giordano

Laudani

et al. 2016

Applied Physics Letters

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A strategy for a scalable synchronization of an array of spin-Hall oscillators (SHOs) is illustrated. In detail, we present micromagnetic simulations of two and five SHOs realized by means of couples of triangular golden contacts on the top of a Pt/CoFeB/Ta trilayer. Results highlight that the synchronization occurs for the whole current region that gives rise to the excitation of self-oscillations. This is linked to the role of the magnetodipolar coupling, which is the phenomenon driving the synchronization when the distance between oscillators is not too large. Synchronization turns out to be also robust against geometrical differences of the contacts, simulated by considering variable distances between the tips ranging from 100nm to 200nm. Besides, it entails an enlargement of the radiation pattern that can be useful for the generation of spin-waves in magnonics applications. Simulations performed to study the effect of the interfacial Dzyaloshinskii-Moriya interaction show nonreciprocity in spatial propagation of the synchronized spin-wave. The simplicity of the geometry and the robustness of the achieved synchronization make this design of array of SHOs scalable for a larger number of synchronized oscillators. a)

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Spin transfer nano-oscillators

Cited by 171 publications

References 126 publications

Phase-locking of multiple magnetic droplets by a microwave magnetic field

Phase-locking of multiple magnetic droplets by a microwave magnetic field

MgO thickness-induced spin reorientation transition in Co0.9Fe0.1/MgO/Co0.9Fe0.1 structure

Scalable synchronization of spin-Hall oscillators in out-of-plane field

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