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Beating the limitation of the Néel temperature of FeO with antiferromagnetic proximity in FeO/CoO

Beating the limitation of the Néel temperature of FeO with antiferromagnetic proximity in FeO/CoO

In our studies we investigated the influence of the proximity of the antiferromagnetic CoO layer on the magnetic properties of ultrathin wüstite (FeO) films. Comparative Mössbauer spectroscopy measurements for MgO/FeO/MgO(001) and MgO/FeO/CoO/MgO(001) show that the neighboring CoO layer can significantly enhance the ordering temperature of wüstite. The TN of CoO in the FeO/CoO bilayer was determined with a use of X-ray magnetic linear dichroism (XMLD) measurements.

Antiferromagnets (AFMs) due to their unique properties are promising candidates for the next generation spintronic materials [1], [2]. A wide group of AFM materials seems to be useless for applications due to the low ordering temperature, above which the long-range antiferromagnetic order vanishes. The limitation of low TN can be overcome using the magnetic proximity effect [3].

Synchrotron SOLARIS users proved, that the proximity of CoO strongly influences the magnetic properties of the FeO layer. For the FeO layers grown on 2 nm-thick CoO, the ordering temperature of FeO was increased by 100 K due to the magnetic proximity. This result shows that the limitation of the low ordering temperature of wüstite can be overcome by the antiferromagnetic proximity. To determine the TN of CoO in the FeO/CoO bilayer, we performed x-ray magnetic linear dichroism (XMLD) measurements. X-ray absorption spectra (XAS) were collected at the PIRX beamline of the National Synchrotron Radiation Centre SOLARIS. Figure 1 shows exemplary normalized XAS spectra for a CoO thickness of 2 nm in FeO/CoO, collected under normal and 60o X-ray incidence angles at 80 K. Systematic studies of CoO XAS spectra as a function of temperature enabled us to determine the TN of CoO in FeO/CoO bilayer.

Figura 1. widma XAS

Fig. 1. Co L3 edge XAS spectra at φ = 0° (black solid line) and φ = 60° (red dashed line) obtained for FeO/CoO at 80 K. Inset shows the measurement geometry. (source: Appl. Phys. Lett. 120, 072404 (2022)).

 

Read the full publication:

A. Kozioł-Rachwał et al., Beating the Limitation of the Néel Temperature of FeO with Antiferromagnetic Proximity in FeO/CoO, Appl Phys Lett 120, 072404 (2022). 

 

[1] V. Baltz, A. Manchon, M. Tsoi, T. Moriyama, T. Ono, and Y. Tserkovnyak, Antiferromagnetic Spintronics, Rev Mod Phys 90, 15005 (2018).

[2] P. K. Manna and S. M. Yusuf, Two Interface Effects: Exchange Bias and Magnetic Proximity, Phys Rep 535, 61 (2014).

[3] D. Hou, Z. Qiu, and E. Saitoh, Spin Transport in Antiferromagnetic Insulators: Progress and Challenges, NPG Asia Mater 11, 35 (2019).

 

Written by: Dr. Anna Kozioł-Rachwał

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