Layered Magnetic Structures: Evidence for Antiferromagnetic Coupling of Fe Layers across Cr Interlayers

Grünberg, P.; Schreiber, R.; Pang, Y.Z.; Brodsky, M. B.; Sowers, H.

doi:10.1103/physrevlett.57.2442

Cited by 2,266 publications

(879 citation statements)

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“…1 The energy balance can be further tailored through the addition of Ru spacer layers with appropriate thicknesses, which establishes antiferromagnetic (AF) interlayer exchange coupling. [15][16][17][18] In [(Co/Pt) X-1 /Co/Ru] N multilayers, both vertically and laterally correlated domain states have been observed. 6,[18][19][20] The reversal modes are determined largely by the sample thickness and magnetization and by the strength of the AF interlayer coupling.…”

Section: Introductionmentioning

confidence: 95%

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: Introductionmentioning

confidence: 95%

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

et al. 2008

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“…An example is the so-called giant magnetoresistance used in data storage devices, magnetic sensors, etc. [8][9][10][11]. Recently, much interest has been attracted towards prac- * danh-tai.hoang@u-cergy.fr † maks@amu.edu.pl ‡ henpusz@amu.edu.pl § diep@u-cergy.fr, corresponding author tical problems such as spin transport, spin valves and spin-torques transfer, due to numerous applications in spintronics.…”

Section: Introductionmentioning

confidence: 99%

Re-orientation transition in molecular thin films: Potts model with dipolar interaction

Hoang¹,

Kasperski²,

Puszkarski³

et al. 2013

J. Phys.: Condens. Matter

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We study the low-temperature behavior and the phase transition of a thin film by Monte Carlo simulation. The thin film has a simple cubic lattice structure where each site is occupied by a Potts parameter which indicates the molecular orientation of the site. We take only three molecular orientations in this paper which correspond to the 3-state Potts model. The Hamiltonian of the system includes: (i) the exchange interaction Jij between nearest-neighbor sites i and j (ii) the long-range dipolar interaction of amplitude D truncated at a cutoff distance rc (iii) a single-ion perpendicular anisotropy of amplitude A. We allow Jij = Js between surface spins, and Jij = J otherwise. We show that the ground state depends on the the ratio D/A and rc. For a single layer, for a given A, there is a critical value Dc below (above) which the ground-state (GS) configuration of molecular axes is perpendicular (parallel) to the film surface. When the temperature T is increased, a re-orientation transition occurs near Dc: the low-T in-plane ordering undergoes a transition to the perpendicular ordering at a finite T , below the transition to the paramagnetic phase. The same phenomenon is observed in the case of a film with a thickness. We show that the surface phase transition can occur below or above the bulk transition depending on the ratio Js/J. Surface and bulk order parameters as well as other physical quantities are shown and discussed.

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“…This coupling has to be strong enough to produce a considerable effect, but cannot be so strong that the individual character of each layer vanishes. Such an intermediate coupling strength can be achieved by utilizing the AFinterlayer exchange coupling [6] and [7].…”

Section: Coupled Ferromagnetic Bilayer Systemsmentioning

confidence: 99%