Phase locking and frequency doubling in spin-transfer-torque oscillators with two coupled free layers

نویسندگان

  • Takahiro Moriyama
  • Giovanni Finocchio
  • Mario Carpentieri
  • Bruno Azzerboni
  • Daniel C. Ralph
  • Robert A. Buhrman
چکیده

Takahiro Moriyama,1 Giovanni Finocchio,2 Mario Carpentieri,3 Bruno Azzerboni,2 Daniel C. Ralph,1,4 and Robert A. Buhrman1 1Cornell University, Ithaca, New York 14853 USA 2Department of Fisica della Materia e Ingegneria Elettronica, University of Messina, C. da di Dio, I-98166 Messina, Italy 3Department of Elettronica, Informatica e Sistemistica, University of Calabria, Via P. Bucci 42C, I-87036 Rende (CS), Italy 4Kavli Institute at Cornell, Cornell University, Ithaca, New York 14853, USA (Received 4 April 2012; revised manuscript received 5 July 2012; published 27 August 2012)

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Bias-Field-Free Spin-Torque Oscillator Based on Two MgO-MTJs with a Shared Free Layer: Micromagnetic Modeling

New types of spintronics devices utilizing all-electrical magnetization manipulation by current, such as spin-torque transfer RAM and spin-torque oscillators, have been developed based on MgO magnetic tunnel junctions (MTJs) [1]. Spin-torque oscillators based on MTJs with in-plane magnetization [2] show high frequency capabilities, but still need an external magnetic field and are characterized...

متن کامل

Geometry Optimization of Spin-Torque Oscillators Composed of Two MgO-MTJs with a Shared Free Layer

New types of spintronics devices utilizing all-electrical magnetization manipulation by current, such as spin-torque transfer RAM and spin-torque oscillators, have been developed based on MgO magnetic tunnel junctions (MTJs) with a large magneto-resistance ratio [1]. Spin-torque oscillators based on a single MTJ with in-plane magnetization [2] show high frequency capabilities, but still need an...

متن کامل

The Transient Behavior of LC and Ring Oscillators under External Frequency Injection

 In this work, time domain analysis is used to solve Adler’s equation in order to obtain the required time, for an oscillator under external injection, reaching the steady-state condition. Mathematical approach has been applied to fully describe the transient of frequency acquisition in injection-locked LC and Ring oscillators considering their time-varying nature. Then, the analysis is verifie...

متن کامل

Phase-Lock Requirements in a Serial Array of Spin Transfer Nano-Oscillators

The most promising approach to attain a narrow linewidth and a large output power simultaneously in spin torque oscillators is self-phase-locking of an array of oscillators. Two long range coupling mechanisms, magnetostatic interaction and self-induced current, are explored. Synchronization occurs with MR ratio ~ 14% and volume ~ 2.1 × 10(-5) μm(3) at room temperature for an experimental freque...

متن کامل

Spin Transfer Torque Driven Coupled Oscillators for Self-Oscillating Radio- Frequency Mixers

magnetic tunnel junction (MTJ) devices are emerging as a possible replacement for complementary metal-oxide semiconductors for radio-frequency (RF) signal generation. Advantages include low power consumption, small device area, and large frequency tunability. This paper shows that single devices cannot achieve the necessary noise performance for RF applications. Various coupling mechanisms are ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2012