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Detection of spin-resolved electronic states from a buried ferromagnetic layer

Date:
June 23, 2014
Source:
National Institute for Materials Science
Summary:
Researchers have successfully detected spin-resolved electronic states from a buried ferromagnetic layer, which had been difficult to detect using conventional spin-resolved photoemission spectroscopy.

Schematic diagrams showing the experimental geometry of newly developed spin-resolved photoemission spectroscopy in this work. (a) Top view. (b) View from X-ray direction. The use of a two-dimensional electron detector allows high-efficient spin-resolved measurements.
Credit: Copyright NIMS

Researchers at the Synchrotron X-ray Station at Spring-8 and Tohoku University have successfully detected spin-resolved electronic states from a buried ferromagnetic layer, which had been difficult to detect using conventional spin-resolved photoemission spectroscopy.

The direct observation of spin-resolved electronic states in a ferromagnetic layer that is buried in nonmagnetic material is critical for the development of devices such as hard disk heads that read data from magnetic recording media. However, it is difficult to obtain detailed information on buried ferromagnetic layers by using traditional spin-resolved photoemission spectroscopy, which is the method to measure the spin-resolved surface electronic states of materials.

In order to measure the spin-resolved electronic states in a buried ferromagnetic layer, the research team used a high-brilliant hard X-ray generated by the third generation synchrotron radiation facility, SPring-8, since hard X-ray photoemission spectroscopy is known to be able to measure the electronic states from buried layers. In addition, the researchers invented a new approach for electron spin detection method, which was combined with hard X-ray photoemission spectroscopy, greatly improving the detection efficiency. For example, the team group successfully detected the spin-resolved electronic states in a ferromagnetic layer made of FeNi (iron-nickel) alloy, which was buried under an Au (gold) thin film using this method.

This new technique enables the direct observation of spin-resolved electronic states of ferromagnetic materials near the interface between the ferromagnetic and nonmagnetic layers. This technique will contribute to improvement in the performance of devices containing ferromagnetic materials and to the development of new spintronics materials through a comparison between the performance of spintronics devices and spin-resolved electronics states in ferromagnetic materials in the vicinity of the interface between the ferromagnetic and nonmagnetic layers.

These results have been published in Applied Physics Letters, a publication of the American Institute of Physics.


Story Source:

The above story is based on materials provided by National Institute for Materials Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. S. Ueda, M. Mizuguchi, T. Kojima, S. Ishimaru, M. Tsujikawa, M. Shirai, K. Takanashi. Detection of spin-resolved electronic structures from a buried ferromagnetic layer utilizing forward Mott scattering. Applied Physics Letters, 2014; 104 (13): 132402 DOI: 10.1063/1.4868248

Cite This Page:

National Institute for Materials Science. "Detection of spin-resolved electronic states from a buried ferromagnetic layer." ScienceDaily. ScienceDaily, 23 June 2014. <www.sciencedaily.com/releases/2014/06/140623091645.htm>.
National Institute for Materials Science. (2014, June 23). Detection of spin-resolved electronic states from a buried ferromagnetic layer. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2014/06/140623091645.htm
National Institute for Materials Science. "Detection of spin-resolved electronic states from a buried ferromagnetic layer." ScienceDaily. www.sciencedaily.com/releases/2014/06/140623091645.htm (accessed September 17, 2014).

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