Magnetization reversal at elevated temperatures in Co/Pt multilayer thin films

Phillips, G.N.; O'Grady, K.; Lodder, J.C.

doi:10.1088/0022-3727/34/19/306

Cited by 4 publications

(7 citation statements)

References 45 publications

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“…We notice here that the tail is much broader than the onset. This has been observed previously [2,4,5] and described as an asymmetry around the coercive field [5]. Additionally, we notice a drop in the reversal curves in Fig.…”

supporting

confidence: 88%

“…These films are also of fundamental interest as interacting dynamical systems. In particular, the precise onset of magnetization reversal, which has been observed before in Co-Pt multilayers [1,2,3,4,5], suggests the shape of the hysteresis loop may be dominated by nucleation. This is the case for some magnetic thin films of interest in recording [2,3,6].…”

mentioning

confidence: 66%

“…This is similar to a previous description of reversal in terms of two coercivities, a nucleation field H n necessary to nucleate reversed domains and a field H p necessary to overcome domain wall pinning. If H n > H p reversal can occur very rapidly following nucleation [1,2]. However, our model is different in that we do not have a single pinning coercivity.…”

mentioning

confidence: 99%

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Hysteresis loops of Co–Pt perpendicular magnetic multilayers

Mobley¹,

Pike²,

Davies³

et al. 2004

J. Phys.: Condens. Matter

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We develop a phenomenological model to study magnetic hysteresis in two samples designed as possible perpendicular recording media. A stochastic cellular automata model captures cooperative behavior in the nucleation of magnetic domains. We show how this simple model turns broad hysteresis loops into loops with sharp drops like those observed in these samples, and explains their unusual features. We also present, and experimentally verify, predictions of this model, and suggest how insights from this model may apply more generally.

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supporting

confidence: 88%

mentioning

confidence: 66%

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Hysteresis loops of Co–Pt perpendicular magnetic multilayers

Mobley¹,

Pike²,

Davies³

et al. 2004

J. Phys.: Condens. Matter

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“…The insets of the Fig.2 illustrate the irreversible susceptibility curves (X irr_DCD and X irr_IRM ), which are the derivatives of the DCD and IRM curves to the applied field. The peak position of the X irr_DCD and X irr_IRM curves represents the reversal domain nucleation and domain wall pinning critical fields, respectively [7,11]. In the inset of the Fig.2, the peak position of X irr_DCD for the 5 repeat sample (at ~467Oe) is on the right of the X irr_IRM peak (at ~435Oe).…”

Section: Resultsmentioning

confidence: 97%

Evolution of Magnetic Interaction in Co/Pd Multilayers

Chai¹,

Lu²,

Wen³

et al. 2017

dtetr

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ABSTRACT Evolution of magnetic interaction has been investigated in Co/Pd multilayer films with 5, 9 and 15 repeats. All these samples were characterized by Isothermal remanence magnetization (IRM), DC demagnetization (DCD) and first order reversal curve (FORC). The δM plots obtained from the IRM and DCD data indicate exchanging coupling evolves into magnetostatic interaction as the repeat increases from 5 to 15. The FORC measurement was used to confirm this evolution and the FORC diagrams exhibit the effect of magnetic interaction on the reversal mechanism.

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“…The perpendicular anisotropy in thin magnetic films can be tuned by the layer thickness to cancel the shape anisotropy. [16][17][18][19] The Barnett effect can be also used to move domain walls. Consider a wire along the y axis, which contains a transverse Bloch wall in the xz plane.…”

Section: ͑10͒mentioning

confidence: 99%

Barnett effect in thin magnetic films and nanostructures

Bretzel

Bauer

Tserkovnyak³

et al. 2009

Applied Physics Letters

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The Barnett effect refers to the magnetization induced by rotation of a demagnetized ferromagnet. We describe the location and stability of stationary states in rotating nanostructures using the Landau-Lifshitz-Gilbert equation. The conditions for an experimental observation of the Barnett effect in different materials and sample geometries are discussed. © 2009 American Institute of Physics. ͓doi:10.1063/1.3232221͔At the dawn of quantum mechanics, the Barnett 1,2 effect-magnetization induced by rotation-confirmed that magnetization is associated with angular momentum. Furthermore, Barnett measured the gyromagnetic ratio of electrons in ferromagnets and the anomalous g factor of the electron for the first time. The Barnett effect can be understood in terms of a rotating gyroscopic wheel, that aligns itself with the axis of rotation until a stationary state in the rotating frame of reference is achieved. Since angular momentum L is associated with magnetization M =−␥L, with ␥ = g B / ប = g͉e͉ / 2m being the gyromagnetic ratio, mechanical rotation induces a net magnetization antiparallel to the axis of rotation. The torque acting on the magnetization in the rotating frame of reference is equivalent to a torque due to the presence of a gauge magnetic fieldThere has recently been a renewed interest in the coupling of magnetization with mechanical motion, for example in mechanically detected ferromagnetic resonance spectroscopy measurements.3 A nanomagnetomechanical system consisting of a cantilever and a thin magnetic film shows coupled magnetovibrational modes. 4,5 Furthermore, the nanomechanical current-driven spin-flip torque at the normalmetal/ferromagnet interface of a suspended nanowire has been detected. 6 In Barnett's original experiments, rotation frequencies of Շ 500 Hz generated a change of the magnetic field of the order of 10 −4 G in macroscopic samples. Although in nanostructures detecting such small fields may become more challenging, a range of powerful techniques have recently been developed, which could be utilized for the purpose. To date, very small changes in the magnetization can be measured using the magneto-optical Kerr effect, Faraday spectroscopy, superconducting quantum interference devices or Hall micromagnetometry.7 Therefore, we present here a theoretical feasibility study of the Barnett effect in magnetic thin films and nanostructures. Our focus is the dynamics in magnetic thin films and nanoclusters, which we study by means of the Landau-Lifshitz-Gilbert ͑LLG͒ equation for the magnetization vector m,where H eff is the effective magnetic field, m is the unit vector of magnetization, and ␣ the dimensionless damping constant. We can separate the dynamics caused by the rotation of the system as a whole from the dynamics in the rotating frame of reference by the transformation m = R͑͒m R and H eff = R͑͒H eff R , where R͑͒ is a unitary matrix describing the rotation by a time-dependent angle ͑t͒ around the axis of rotation and m R ͑H eff R ͒ denote the magnetization ͑effective magnetic fiel...

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Magnetization reversal at elevated temperatures in Co/Pt multilayer thin films

Cited by 4 publications

References 45 publications

Hysteresis loops of Co–Pt perpendicular magnetic multilayers

Hysteresis loops of Co–Pt perpendicular magnetic multilayers

Evolution of Magnetic Interaction in Co/Pd Multilayers

Barnett effect in thin magnetic films and nanostructures

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