Switching a spin valve back and forth by current-induced domain wall motion

Grollier, Julie; Boulenc, P.; Cros, Vincent; Hamzić, Amir; Vaurés, A.; Fert, A.; Faini, G.

doi:10.1063/1.1594841

Cited by 366 publications

(279 citation statements)

References 17 publications

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“…The original reports [27][28][29] of DW propagation by electrical currents through nanowires have led to enormous subsequent interest in the process. This approach offers highly efficient, unidirectional DW motion independent of the adjacent magnetic domain configuration.…”

Section: Basic Observationsmentioning

confidence: 99%

Nanowire spintronics for storage class memories and logic

Hrkac

Dean

Allwood

2011

Phil. Trans. R. Soc. A.

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Patterned magnetic nanowires are extremely well suited for data storage and logic devices. They offer non-volatile storage, fast switching times, efficient operation and a bistable magnetic configuration that are convenient for representing digital information. Key to this is the high level of control that is possible over the position and behaviour of domain walls (DWs) in magnetic nanowires. Magnetic random access memory based on the propagation of DWs in nanowires has been released commercially, while more dynamic shift register memory and logic circuits have been demonstrated. Here, we discuss the present standing of this technology as well as reviewing some of the basic DW effects that have been observed and the underlying physics of DW motion. We also discuss the future direction of magnetic nanowire technology to look at possible developments, hurdles to overcome and what nanowire devices may appear in the future, both in classical information technology and beyond into quantum computation and biology.

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Section: Basic Observationsmentioning

confidence: 99%

Nanowire spintronics for storage class memories and logic

Hrkac

Dean

Allwood

2011

Phil. Trans. R. Soc. A.

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“…11 The opposite effect, i.e., the manipulation of magnetization with spin current, is called spin transfer. [12][13][14][15] Recently, the possibility of manipulating with current the position of a magnetic domain wall via spin transfer torques has attracted a great deal of theoretical [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] and experimental [31][32][33][34][35][36][37][38] interest. Although the subject is still controversial, 18,21 it is by now established that in the longwavelength limit, the equation of motion for the magnetization direction ⍀, which in the absence of current describes damped precession around the effective field −␦E MM ͓⍀͔ / ͑ប␦⍀͒, is given by…”

Section: Introductionmentioning

confidence: 99%

Spin pumping by a field-driven domain wall

2008

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We present the theory of spin pumping by a field-driven domain wall for the situation that spin is not fully conserved. We calculate the pumped current in a metallic ferromagnet to first order in the time derivative of the magnetization direction. Irrespective of the microscopic details, the result can be expressed in terms of the conductivities of the majority and minority electrons and the dissipative spin transfer torque parameter ␤. The general expression is evaluated for the specific case of a field-driven domain wall and for that case depends strongly on the ratio of ␤ and the Gilbert damping constant. These results may provide an experimental method to determine this ratio, which plays a crucial role for current-driven domain-wall motion.

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“…In the case of soft magnetic nanostripes, "head-to-head" or "tail-to-tail" transverse-or vortex-type DWs are present in an equilibrium ground state, as calculated 5 and observed by various experimental techniques. [6][7][8][9] Recently, the high-velocity propagation, in ferromagnetic nanostripes, of a single DW driven by an applied magnetic field H or spin-polarized current has attracted considerable and growing interest, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] owing to its crucially important applications to information-storage 21,22 and logic 23 devices. It is known that the DW type varies depending on the given width and thickness of the nanostripes, and transverse walls ͑the DW magnetization has nonzero component transverse to the stripe length͒ or vortex walls can be stabilized depending on the geometrical parameters.…”

Section: Introductionmentioning

confidence: 99%

Dynamic transformations of the internal structure of a moving domain wall in magnetic nanostripes

et al. 2007

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The magnetic field ͑or electric current͒ driven domain-wall motion in magnetic nanostripes is of considerable interest because it is essential to the performance of information-storage and logic devices. One of the current key problems is to understand the complex behaviors of oscillatory domain-wall motions under applied magnetic fields stronger than the so-called Walker field, beyond which the velocity of domain walls markedly drops. In a certain range just above the Walker field, the motions are not chaotic but rather periodic with different periodicities of dynamic transformations of a moving domain wall between the different types of its internal structure. In addition, three different periodicities of the dynamic transformations are calculated, which consist of different types of domain-wall structures that are transformed from one type to another. The transformation periods vary with the field strength and the nanostripe width. This phenomenon can be described by the dynamic motion of a limited number of magnetic topological solitons such as the vortex and antivortex confined in nanostripes. These results provide a considerably better understanding and details of the domainwall motions in soft magnetic nanostripes.

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Switching a spin valve back and forth by current-induced domain wall motion

Cited by 366 publications

References 17 publications

Nanowire spintronics for storage class memories and logic

Nanowire spintronics for storage class memories and logic

Spin pumping by a field-driven domain wall

Dynamic transformations of the internal structure of a moving domain wall in magnetic nanostripes

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