Anisotropy dependence of irreversible switching in Fe∕SmCo and FeNi∕FePt exchange spring magnet films

Davies, Joseph E.; Hellwig, Olav; Fullerton, Eric E.; Jiang, J. S.; Bader, S. D.; Zimányi, Gergely T.; Liu, Kai

doi:10.1063/1.1954898

Cited by 141 publications

(103 citation statements)

References 22 publications

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“…In order to study the magnetization reversal behavior, we have employed a FORC technique, as described in prior publications. 7,25,27 After saturation, the magnetization M is measured starting from a reversal field H R back to positive saturation, tracing out a FORC. A family of FORC's is measured at different H R , with equal field spacing, covering the entire major loop from the onset of reversal until true saturation.…”

Section: Methodsmentioning

confidence: 99%

“…The reversal behavior was investigated using a first-order reversal curve (FORC) method. 7,[23][24][25] FORC has been utilized previously to "fingerprint" the reversal behavior of Co/Pt multilayers, without Ru spacer layers. 7 The current FORC analysis of the [(Co/Pt) X-1 /Co/Ru] N samples allows the identification of the laterally and vertically correlated reversal modes as well as the complex interplay between them as temperature and magnetic field are varied.…”

Section: Introductionmentioning

confidence: 99%

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Temperature-dependent magnetization reversal in(Co∕Pt)∕Rumultilayers

et al. 2008

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TitleTemperature-dependent magnetization reversal in (Co/Pt)/Ru multilayers AbstractAntiferromagnetically coupled (Co/Pt)/Ru multilayers with perpendicular anisotropy have been shown to exhibit both vertically and laterally correlated magnetization reversal modes.In this work the magnetization reversal of a multilayer film whose layer thicknesses have been tuned to be at the phase boundary between the two reversal modes has been investigated as a function of temperature using the first-order reversal curve (FORC) method. At high temperatures reversal via vertically correlated stripe domains throughout the film thickness is observed, similar to that in Co/Pt films without the Ru spacers. At low temperatures antiferromagnetic (AF) interlayer exchange coupling dominates, and laterally correlated reversal is observed with an AF coupled remanent state. Under magnetic field cycling, dipolar fields can transform the sample back into a vertically correlated domain state, thus leading to an exotic behavior with FORC's existing outside the major hysteresis loop. Calculations show that the laterally correlated reversal mode is indeed slightly more stable, and the crossover to vertically correlated reversal can be induced by temperature as well as magnetic field.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature-dependent magnetization reversal in(Co∕Pt)∕Rumultilayers

et al. 2008

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“…In fact, this FORC distribution is characteristic of polycrystalline hard/soft exchange spring magnets. 23 The magnetically hard and soft phases are the Co/Pt deposited on top of the AAO and those near the perimeters of the pores, respectively, and the two phases are physically connected, giving rise to the exchange coupling. This is also consistent with the positive peak found in the ⌬M plot shown in Fig.…”

Section: -mentioning

confidence: 99%

Controlling magnetization reversal in Co/Pt nanostructures with perpendicular anisotropy

Rahman¹,

Dumas²,

Eibagi³

et al. 2009

Applied Physics Letters

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We demonstrate a simple method to tailor the magnetization reversal mechanisms of Co/Pt multilayers by depositing them onto large area nanoporous anodized alumina (AAO) with various aspect ratios, A = pore depth/diameter. Magnetization reversal of composite (Co/Pt)/AAO films with large A is governed by strong domain-wall pinning which gradually transforms into a rotation-dominated reversal for samples with smaller A, as investigated by a first-order reversal curve method in conjunction with analysis of the angular dependent switching fields. The change of the magnetization reversal mode is attributed to topographical changes induced by the aspect ratio of the AAO templates.

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“…͑5͒ and ͑6͒ for ⍜͑H , T͒, that the magnetic state of the sandwich is of the spring-ferromagnet type. 19 The lowering of temperature leads at the same time to a lower switching field of the magnetically hard layer, which is due to the stronger effective magnetic torque on the top layer in the coupled F0/f/F2 state. This thermally-controlled interlayer exchange coupling is perfectly reversible on thermal cycling within the given temperature range.…”

Section: A Thermally Assisted Exchange Decoupling In F/f/f Multilayersmentioning

confidence: 99%

Thermoelectrical manipulation of nanomagnets

Kadigrobov

Andersson

Radić

et al. 2010

Journal of Applied Physics

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We investigate the interplay between the thermodynamic properties and spin-dependent transport in a mesoscopic device based on a magnetic multilayer (F/f/F), in which two strongly ferromagnetic layers (F) are exchange-coupled through a weakly ferromagnetic spacer (f) with the Curie temperature in the vicinity of room temperature. We show theoretically that the Joule heating produced by the spin-dependent current allows a spin-thermo-electronic control of the ferromagnetic-to-paramagnetic (f/N) transition in the spacer and, thereby, of the relative orientation of the outer F-layers in the device (spin-thermo-electric manipulation of nanomagnets). Supporting experimental evidence of such thermally controlled switching from parallel to antiparallel magnetization orientations in F/f(N)/F sandwiches is presented. Furthermore, we show theoretically that local Joule heating due to a high concentration of current in a magnetic point contact or a nanopillar can be used to reversibly drive the weakly ferromagnetic spacer through its Curie point and thereby exchange couple and decouple the two strongly ferromagnetic F-layers. For the devices designed to have an antiparallel ground state above the Curie point of the spacer, the associated spin-thermionic parallel-to-antiparallel switching causes magneto-resistance oscillations whose frequency can be controlled by proper biasing from essentially DC to GHz. We discuss in detail an experimental realization of a device that can operate as a thermo-magneto-resistive switch or oscillator.Comment: This paper, published in J. Appl. Phys. 107, 123706 (2010), is an expanded version of arXiv:0710.5477 (8 pages, 12 figures, two additional authors and experimental section added

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Anisotropy dependence of irreversible switching in Fe∕SmCo and FeNi∕FePt exchange spring magnet films

Cited by 141 publications

References 22 publications

Temperature-dependent magnetization reversal in(Co∕Pt)∕Rumultilayers

Temperature-dependent magnetization reversal in(Co∕Pt)∕Rumultilayers

Controlling magnetization reversal in Co/Pt nanostructures with perpendicular anisotropy

Thermoelectrical manipulation of nanomagnets

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