Perpendicular Exchange Bias of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Co</mml:mi><mml:mi>/</mml:mi><mml:mi>Pt</mml:mi></mml:math>Multilayers

Maat, S.; Takano, K.; Parkin, S. S. P.; Fullerton, Eric E.

doi:10.1103/physrevlett.87.087202

Cited by 289 publications

(179 citation statements)

References 23 publications

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“…We used Si substrates coated with Si 3 N x and a 200 Å Pt buffer layer. The Co and Pt layer thicknesses were chosen to obtain perpendicular anisotropy, 26 while the Ru thickness was used to maximize the AF-interlayer coupling between adjacent Co/Pt stacks. 18 Magnetic properties were studied using an alternating gradient magnetometer (AGM) and vibrating sample magnetometer (VSM).…”

Section: Methodsmentioning

confidence: 99%

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%

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

et al. 2008

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“…However, for applications, perpendicular uniaxial and unidirectional anisotropies are more desirable owing to a larger thermal stability of encoded information 23 . For instance, antiferromagnets in contact to ferromagnets with perpendicular anisotropy like Co/Pt multilayers and CoPt 3 layers have been shown to exhibit EB and all other macroscopic behaviour of EB systems, like training effect, enhanced coercivity and blocking temperature for the onset of the EB [23][24][25][26] . More recently, the perpendicular EB (PEB) was demonstrated in a novel exchange-coupled system Sm 1 − 0.028 Gd 0.028 Al 2 /SmAl 2 based on the zero magnetization ferromagnet Sm 1 − 0.028 Gd 0.028 Al 2 as the pinning layer 27 .…”

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Perpendicular exchange bias in ferrimagnetic spin valves

et al. 2012

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The exchange bias effect refers to the shift of the hysteresis loop of a ferromagnet in direct contact to an antiferromagnet. For applications in spintronics a robust and tunable exchange bias is required. Here we show experimental evidence for a perpendicular exchange bias in a prototypical ferrimagnetic spin valve consisting of DyCo 5 /Ta/Fe 76 Gd 24 , where the DyCo 5 alloy has the role of a hard ferrimagnet and Fe 76 Gd 24 is a soft ferrimagnet. Taking advantage of the tunability of the exchange coupling between the ferrimagnetic layers by means of thickness variation of an interlayer spacer, we demonstrate that perpendicular unidirectional anisotropy can be induced with desirable absolute values at room temperature, without making use of a field-cooling procedure. moreover, the shift of the hysteresis loop can be reversed with relatively low magnetic fields of several hundred oersteds. This flexibility in controlling a robust perpendicular exchange bias at room temperature may be of crucial importance for applications.

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“…Assuming a 10-15 Å naturally occurring overlayer of CoO, 27 the electric field penetrating the Co surface is calculated to be 8.74 × 10 8 V/m and extends into the metallic Co layer over a distance of ~1.5 Å, altering the spin polarization over this depth because of unequal spin-up and spin-down screening charge densities. 2,5 From our data the maximum change in the anisotropy due to the induced electric field is ΔK eff /ΔE = 4.5 × 10 -5 J/(m 2 V).…”

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Ferroelectric Control of Magnetic Anisotropy

2011

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We demonstrate unambiguous evidence of the electric field control of magnetic anisotropy in a wedge-shaped Co film of varying thickness. A copolymer ferroelectric of 70% vinylidene fluoride with 30% trifluoroethylene, P(VDF-TrFE) overlays the Co wedge, providing a large switchable electric field. As the ferroelectric polarization is switched from up to down, the magnetic anisotropy of the Co films changes by as much as 50%. At the lowest Co thickness the magnetic anisotropy switches from out-of-plane to in-plane as the ferroelectric polarization changes from up to down, enabling us to rotate the magnetization through a large angle at constant magnetic field merely by switching the ferroelectric polarization. The large mismatch in the stiffness coefficients between the polymer ferroelectric and metallic ferromagnet excludes typical magnetoelectric strain coupling; rather, the magnetic changes arise from the large electric field at the ferroelectric/ferromagnet interface.

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Perpendicular Exchange Bias ofCo/PtMultilayers

Cited by 289 publications

References 23 publications

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

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

Perpendicular exchange bias in ferrimagnetic spin valves

Ferroelectric Control of Magnetic Anisotropy

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