Exchange-bias-like coupling in a ferrimagnetic Fe/Tb multilayer

Paul, Amitesh; Mukherjee, Saumya; Kreuzpaintner, Wolfgang; Böni, P.

doi:10.1103/physrevb.89.144415

Cited by 28 publications

(38 citation statements)

References 35 publications

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“…The T B and T F gradually decrease with increasing field values. This is unlike the case for the undiluted system where we observed different variations of T B and T F with field [8].…”

Section: Resultscontrasting

confidence: 53%

“…This is very different from a ferromagnetic behavior in an undiluted sample as has been shown in Ref. 8. Here the M R and H c values go to zero around 220 K, which is typical for a paramagnet.…”

Section: Resultsmentioning

confidence: 77%

“…This shift in the AC-peak temperature T AC max with frequency is typical of SPM or SSG clusters. Note that no such peak shift with frequency was observed in the undiluted system or in the Tb bulk specimen [8].…”

Section: Resultsmentioning

confidence: 95%

“…In case of the Tb/Fe multilayer system investigated earlier, it was found that the hysteresis loop consists of DHL [8]. Such DHLs were associated with planar DWs.…”

Section: Polarized Neutron Measurementsmentioning

confidence: 99%

“…The maximum exchange bias field in such systems is determined by the energy it takes to form a π (bilayer) or 2π (multilayer) planar domain wall (DW) within the softer TM layer. Recently, field cooling of a (TM-RE) Fe/Tb-multilayer system was shown to form a double hysteresis loop (DHL) with exchange-bias-like shifts along and opposite to the field cooling axis, below the ordering temperature of the RE [8]. For the antiferromagnetically aligned (AF-coupled) individual layers of Fe and Tb, there exists a possibility of forming 2π-DWs within the Fe layers, blocked by the anisotropic Tb layers on both sides of Fe.…”

Section: Introductionmentioning

confidence: 99%

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Exchange-bias-like coupling in a Cu-diluted-Fe/Tb multilayer

et al. 2015

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Transition metal-rare earth (TM-RE) Fe/Tb-multilayer systems have been known to show exchange-bias-like shifts in the form of double hysteresis loop (DHL) along and opposite to the field cooling axis. Planar domain walls (DW), with opposite handedness at the interfaces, are held responsible for such DHL. Here, we report on the formation of nanoparticulated Fe layers in the Cu-matrix within a Fe-Cu/Tb multilayer and their eventual low temperature characteristics. AC susceptibility measurements indicate that these diluted magnetic clusters have a superspin-glass type of freezing behavior. Eventually, this Fe-cluster/Tb interlayer interaction, which is conjectured to be mediated by the pinned moments within the individual clusters, has helped in increasing the exchange bias field in the system to a high value of ≈1.3 kOe which gradually vanishes around 50 K. Polarized neutron reflectivity confirms a very strong antiferromagnetic (AF) coupling between the individual layers. The magnitude of the magnetic moment of each of the individual Tb or Fe-Cu layer remains similar but due to the strong AF-coupling at the interfaces, the entire ferrimagnetic Fe-Cu/Tb entity flips its direction at a compensation field of around 3.7 kOe. This study shows that magnetic dilution can be an effective way to manipulate the possible domain walls or the clusters in TM and thereby the exchange bias in TM-RE systems.

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“…The T B and T F gradually decrease with increasing field values. This is unlike the case for the undiluted system where we observed different variations of T B and T F with field [8].…”

Section: Resultscontrasting

confidence: 53%

Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 95%

“…In case of the Tb/Fe multilayer system investigated earlier, it was found that the hysteresis loop consists of DHL [8]. Such DHLs were associated with planar DWs.…”

Section: Polarized Neutron Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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