Investigation and tailoring the strengths of positive and negative exchange bias in the ion-beam sputtered Ni81Fe19/Ir7Mn93 bilayers by tuning the grain size of the antiferromagnetic Ir7Mn93 layer

Kumar Kedia, Sanjay; Kumar, Nakul; Sharma, Nikita; Pandey, Lalit; Kumar Gupta, Nanhe; Chaudhary, Sujeet

doi:10.1016/j.jmmm.2023.171073

Journal of Magnetism and Magnetic Materials

2023

DOI: 10.1016/j.jmmm.2023.171073

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Investigation and tailoring the strengths of positive and negative exchange bias in the ion-beam sputtered Ni81Fe19/Ir7Mn93 bilayers by tuning the grain size of the antiferromagnetic Ir7Mn93 layer

Sanjay Kumar Kedia,

Nakul Kumar,

Nikita Sharma

et al.

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Cited by 3 publications

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Defect-induced modulation of the exchange anisotropy by swift heavy ion irradiation in Ni81Fe19/Ir7Mn93 bilayers

Kumar Kedia,

Tripathi,

Chaudhary

2024

Nuclear Instruments and Methods in Physics Research Section B:

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Defect-induced modulation of the exchange anisotropy by swift heavy ion irradiation in Ni81Fe19/Ir7Mn93 bilayers

Kumar Kedia,

Tripathi,

Chaudhary

2024

Nuclear Instruments and Methods in Physics Research Section B:

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Tuning of exchange bias by regulating the microstructural parameters in Ni81Fe19 (5, 8, 11, 14, 17, and 20 nm)/Ir7Mn93(10 nm) bilayers probed using magnetoresistance

Kedia,

Sharma,

Pandey

et al. 2023

Journal of Applied Physics

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The investigation and tunning of positive exchange bias (PEB) and negative exchange bias (NEB) are reported at room temperature (RT) and low temperature (20 K), respectively, in a series of top-pinned Ni81Fe19(tFM = 5, 8, 11, 14, 17, and 20 nm)/Ir7Mn93(10 nm) polycrystalline heterostructure thin films grown in the presence of a 1 kOe in situ magnetic field by systematically controlling the microstructural parameters such as thickness, roughness, and crystallite/grain size. On decreasing the thickness (roughness) of NiFe from 20 nm (0.49 nm) to 5 nm (0.28 nm), an enhancement in PEB and NEB is observed from +12 to +22 Oe and −300 to −556 Oe at RT and 20 K, respectively. It is observed that both exchange bias and coercivity substantially depend on the atomic scale roughness of the interface width (NiFe/IrMn). The representative plane-view of transmission electron microscopy (TEM) measurements revealed the enhanced antiferromagnet (AF) grain size on decreasing the thickness of ferromagnetic, whereas cross-sectional TEM studies exhibited the sharp interfaces in the bilayer samples after magnetic annealing. A unique correlation between the training mechanism and the degree of asymmetry is established. Further, the training measurement data are fitted with various theoretical models that support the fact that not only interfacial but also bulk AF spins play a vital role in the exchange bias. Thus, the present study reveals the microstructural insights by varying the thickness of NiFe to address the unresolved issues of the EB by directly correlating it with interface roughness and the crystallite/grain size of AF in it, probed using the magnetoresistance technique.

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Grain diameter-dependent tuning of exchange anisotropy in the ion-beam sputtered Co-based full Heusler alloy coupled with antiferromagnet

Kedia,

Kumar,

Sharma

et al. 2024

Journal of Applied Physics

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We report an investigation into the substantially large and customizable exchange anisotropy (HEA) and coercivity (HC) in a set of bottom-pinned Ir7Mn93/Co2FeAl bilayer heterostructures fabricated using ion-beam sputtering at room temperature (RT) in the presence of an in-situ in-plane static magnetic field of 1 kOe. This modulation is achieved by controlling the microstructural parameter (i.e., grain diameter) of the antiferromagnetic (AF) Ir7Mn93 (IrMn) layer. These bilayers revealed strong positive exchange anisotropy (PEA) at RT, while negative exchange anisotropy (NEA) became evident when field-cooled to 15 K in the presence of 3 kOe. By systematically controlling the AF grain diameter from ∼5.39 to ∼6.94 nm, the PEA and NEA were found to increase by a factor of ∼2.1 and ∼1.8, respectively. However, once the AF grain diameter exceeded the necessary threshold for thermal stability, further enhancement in grain diameter above ∼6.94 nm led to a reduction in both HEA and HC. This decrease was attributed to a reduction in pinning centers at the AF/FM (ferromagnet) interface. The training data are fitted by utilizing various theoretical models, such as thermal relaxation, Binek's model, and spin relaxation model. The spin relaxation model was found to be applicable to fit the complete range of training data, encompassing both thermal and athermal decay, within the context of frozen and rotatable spins.

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Investigation and tailoring the strengths of positive and negative exchange bias in the ion-beam sputtered Ni81Fe19/Ir7Mn93 bilayers by tuning the grain size of the antiferromagnetic Ir7Mn93 layer

Cited by 3 publications

References 47 publications

Defect-induced modulation of the exchange anisotropy by swift heavy ion irradiation in Ni81Fe19/Ir7Mn93 bilayers

Defect-induced modulation of the exchange anisotropy by swift heavy ion irradiation in Ni81Fe19/Ir7Mn93 bilayers

Tuning of exchange bias by regulating the microstructural parameters in Ni81Fe19 (5, 8, 11, 14, 17, and 20 nm)/Ir7Mn93(10 nm) bilayers probed using magnetoresistance

Grain diameter-dependent tuning of exchange anisotropy in the ion-beam sputtered Co-based full Heusler alloy coupled with antiferromagnet

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