Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system

Rai, Anish; Dunz, Mareike; Sapkota, Arjun; Zilske, P.; Mohammadi, Jamileh Beik; Meinert, Markus; Mewes, Claudia; Mewes, Tim

doi:10.1016/j.jmmm.2019.04.043

Cited by 9 publications

(2 citation statements)

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“…For device integration, the antiferromagnet should be easy to prepare, generate exchange bias fields that are clearly higher than corresponding coercive fields and be thermally stable at typical device operation temperatures. As we recently reported [10][11][12][13], antiferromagnetic MnN is a very promising candidate. MnN crystallizes in the θ−phase of the Mn−N phase diagram [14], a tetragonal variant of the NaCl structure with a = b = 4.256 Å and c = 4.189 Å at room temperature [15].…”

Section: Introductionmentioning

confidence: 95%

Improving thermal stability of MnN/CoFeB exchange bias systems by optimizing the Ta buffer layer

Dunz,

Meinert

2020

Preprint

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We investigated the influence of the Ta buffer layer on the thermal stability of polycrystalline Ta/ MnN/ CoFeB exchange bias systems, showing high exchange bias of about 1800 Oe at room temperature. The thermal stability of those trilayer systems is limited by nitrogen diffusion that occurs during annealing processes. Most of the nitrogen diffuses into the Ta buffer layer, which is necessary for good crystal growth of MnN and thus a crucial component of the exchange bias system. In order to improve the thermal stability, we prepared exchange bias stacks where we varied the Ta thickness to look for an optimum value that guarantees stable and high exchange over a broad temperature range. Our findings show that thin layers of 2 − 5 nm Ta indeed support stable exchange bias up to annealing temperatures of more than 550 • C. Furthermore, we found that the introduction of a TaNx layer between MnN and Ta, acting as a barrier, can prevent nitrogen diffusion. However, our results show that those measures, even though being beneficial in terms of thermal stability, often lead to decreased crystallinity and thus lower the exchange bias.

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Section: Introductionmentioning

confidence: 95%

Improving thermal stability of MnN/CoFeB exchange bias systems by optimizing the Ta buffer layer

Dunz,

Meinert

2020

Preprint

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“…Over the last several years, there have been a number of publications exploring the properties of the equiatomic AF alloy MnN. For instance, broadband ferromagnetic resonance and in-plane angle-dependent measurements have been used to determine the in-plane anisotropies and relaxation of MnN/CoFeB bilayers [11]. One of the attractive properties of this material is that scarcity is not an issue.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments on MnN for Spintronic Applications

Vallejo-Fernández

Meinert

2021

Magnetochemistry

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There is significant interest worldwide to identify new antiferromagnetic materials suitable for device applications. Key requirements for such materials are: relatively high magnetocrystalline anisotropy constant, low cost, high corrosion resistance and the ability to induce a large exchange bias, i.e., loop shift, when grown adjacent to a ferromagnetic layer. In this article, a review of recent developments on the novel antiferromagnetic material MnN is presented. This material shows potential as a replacement for the commonly used antiferromagnet of choice, i.e., IrMn. Although the results so far look promising, further work is required for the optimization of this material.

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Ferromagnetic Resonance

Mewes

2021

Magnetic Measurement Techniques for Materials Characterization

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January 2010 he is an academic partner of the Niğde University. His current research interests include ferromagnetic resonance, microwave technology, magnetic nanostructures (nanowires, nanoparticles and magnetic nano O-ring), and spin-Peierls systems. Dr. Yalçın has published many papers in journals listed in the Science Citation Index, and several invited chapters in books released by international publishers.

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Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system

Cited by 9 publications

References 34 publications

Improving thermal stability of MnN/CoFeB exchange bias systems by optimizing the Ta buffer layer

Improving thermal stability of MnN/CoFeB exchange bias systems by optimizing the Ta buffer layer

Recent Developments on MnN for Spintronic Applications

Ferromagnetic Resonance

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