Temperature dependence of large exchange-bias in TbFe-Co/Pt

Romer, Sara; Marioni, Miguel A.; Thorwarth, K.; Joshi, Nitin; Corticelli, C. E.; Hug, Hans J.; Oezer, S.; Parlinska-Wojtan, Magdalena; Rohrmann, H.

doi:10.1063/1.4767142

Cited by 32 publications

(38 citation statements)

References 23 publications

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“…GdCo 2 -Co and TbFe-[Co/Pt]. [15][16] Recently, polycrystalline Heusler compounds Ni-Mn-X (X = Sn, In, Sb) and Mn-Pt-Ga have been reported to show an intrinsic EB at low temperature due to the coexistence of FM and AFM regions. 6,7,17,18 However, ongoing efforts seek to engineer more desirable properties, such as high Néel temperature, large magnetic anisotropy and good chemical and structural tunability.…”

Section: Main Contentmentioning

confidence: 99%

Exchange bias and bistable magneto-resistance states in amorphous TbFeCo thin films

Chung

et al. 2016

Applied Physics Letters

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Abstract:Amorphous TbFeCo thin films sputter deposited at room temperature on thermally oxidized Si substrate are found to exhibit strong perpendicular magnetic anisotropy (PMA). Atom probe tomography (APT), scanning transmission electron microscopy (STEM), and energy dispersive spectroscopy (EDS) mapping have revealed two nanoscale amorphous phases with different Tb atomic percentages distributed within the amorphous film. Exchange bias accompanied by bistable magneto-resistance states has been uncovered near room temperature by magnetization and magneto-transport measurements. The exchange anisotropy originates from the exchange interaction between the ferrimagnetic and ferromagnetic components corresponding to the two amorphous phases. This study provides a platform for exchange bias and magneto-resistance switching using single-layer amorphous ferrimagnetic thin films that require no epitaxial growth. a

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Section: Main Contentmentioning

confidence: 99%

Exchange bias and bistable magneto-resistance states in amorphous TbFeCo thin films

Chung

et al. 2016

Applied Physics Letters

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“…In addition to AFM/FM interfaces, EB has also been reported in systems with ferrimagnetic (FI)/FM layers [10][11][12][13][14][15][16][17][18][19][20][21][22][23], resulting in giant EB fields in the order of several tens of kilo-Oersteds [13,14,[24][25][26]. In particular, FI layers consisting of amorphous heavy rare earth (RE)-3d transition metal (TM) alloys provide further benefits as a pinning layer since these alloys can exhibit large interfacial exchange interaction and zero moment at the compensation temperature T comp .…”

Section: Introductionmentioning

confidence: 99%

Double exchange bias in ferrimagnetic heterostructures

et al. 2017

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We report on the magnetic reversal characteristics of exchange coupled ferrimagnetic (FI) Tb 19 Fe 81 /Tb 36 Fe 64 heterostructures. Both layers are amorphous and exhibit strong perpendicular magnetic anisotropy. The investigated heterostructures consist of a Tb-dominated and a Fe-dominated FI layer. Thus, in the magnetic ground state the net moments of the individual layers are oppositely aligned due to antiferromagnetic coupling of Fe and Tb moments. By cooling the system below 160 K, a large positive and negative exchange bias (EB) effect appears for the Tb-and Fe-dominated layers, respectively. The biasing depends only on the initial magnetization state and is neither affected by a cooling field nor by loop cycling. The phenomenon can be explained by the presence of a hard magnetic Fe-dominated interfacial layer, which forms during the sputter deposition process due to interface mixing and resputtering effects. This interfacial layer acts as a pinning layer below a certain temperature, where its coercivity increases to values larger than the accessible magnetic field range. This assumption is further supported by introducing a 0.9-nm-thick Ru spacer layer, which causes the EB effect to vanish. The EB effect was further investigated for a sample series, where the thickness ratio of the two Tb-Fe layers was varied, while keeping the total thickness of the bilayers constant. Only samples where the individual layers are sufficiently thick reveal double shifted loops, indicating the high sensitivity of the observed bias effect with respect to the magnetic properties of the individual layers and their interfacial area.

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“…or giant exchange bias [2]. In particular, Gd-Co amorphous alloys are a very simple RE-TM ferrimagnetic material where the Gd and Co moments are antiferromagnetically coupled and collinear [19].…”

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confidence: 99%

Tuning interfacial domain walls in GdCo/Gd/GdCo′ spring magnets

et al. 2015

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Spring magnets based on GdCo multilayers have been prepared to study the nucleation and evolution of interfacial domain walls (iDW) depending on layer composition and interlayer coupling. GdCo alloy compositions in each layer were chosen so that their net magnetization aligns either with the Gd (Gd 35 Co 65 ) or Co (Gd 11 Co 89 ) sublattices. This condition forces an antiparallel arrangement of the layers' net magnetization and leads to nucleation of iDWs above critical magnetic fields whose values are dictated by the interplay between Zeeman and exchange energies. By combining x-ray resonant magnetic scattering with Kerr magnetometry we provide detailed insight into the nucleation and spatial profile of the iDWs. For strong coupling (GdCo/GdCo' bilayer), iDWs are centered at the interface but with asymmetric width depending on each layer magnetization. When interlayer coupling is weakened by introducing a thin Gd interlayer, the exchange spring effect becomes restricted to a lower temperature and field range than observed in the bilayer structure. Due to the ferromagnetic alignment between the high magnetization Gd 35 Co 65 layer and the Gd interlayer, the iDW shrinks and moves into the lower exchange Gd interlayer causing a reduction of interfacial domain wall energy.2

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Temperature dependence of large exchange-bias in TbFe-Co/Pt

Cited by 32 publications

References 23 publications

Exchange bias and bistable magneto-resistance states in amorphous TbFeCo thin films

Exchange bias and bistable magneto-resistance states in amorphous TbFeCo thin films

Double exchange bias in ferrimagnetic heterostructures

Tuning interfacial domain walls in GdCo/Gd/GdCo′ spring magnets

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