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Magnon generation and detection in organic based magnet

Date: 2018-07-04
Time: 10:00
Venue: 中科院物理研究所 M 楼 236会议室
Speaker: Haoliang Liu

Department of Physics and Astronomy, University of Utah

As the limitations of electrical circuitry are reached, new paradigms are needed to develop future generations of fast and reduced energy dissipation (less lossy) miniature information
processing devices. Nearly all existing electronic devices are based on controlling the electric chargeby electric fields. Electrons also possess a “spin” that gives them their magnetic properties. Spin density fluctuations in magnetically ordered materials such as ferromagnetic metals and insulators can propagate in the form of spin waves, i.e.,
quantized by magnons. Magnons are considered as a potential data carrier in information storage and transport,known as Magnonics. Magnonics is less prone of the inherent weakness of
conventional electronics, i.e., Joule heating. Up to now, magnetic insulator, such as yttrium iron garnet (YIG),has been the main candidate for magnonic devices, which can transfer information over
macroscopic distance due to its low Gilbert damping. However, YIG films used for magnonics are difficult to grow and integrate into device structures, since they are epitaxially grown as
single crystals at very high temperature. Here we report an alternative candidate for magnonic devices, namely organic magnetic compounds. Attempts to measure magnons in an organic
based magnet will be discussed.

2015.09-present    Postdoc in Z. Valy Vardeny’s  group at University of Utah, US
2012.09-2015.09   Postdoc in Prof. Chris Van Haesendonck’s group at KU Leuven, Belgium
2007.09-2012.08   PhD degree, Institute of Physics, Chinese Academy of Sciences
2003.09-2007.07   B.S. (Physics), Lanzhou University, China
H. Liu is currently working on organic spintronics including magnonics, spin pumping and spin caloritronics in organic semiconductors. Magnons and spin pumping in organic materials
are characterized by broadband ferromagnetic resonance, Inverse spin Hall effect, Brillouin light scattering. Spin caloritronics in organic materials are investigated by electric means and
optical means of ultrasensitive Sagnac Magnetooptic Kerr effect interferometry. Previous, H. Liu has experiences in spintronics and magnetism. H. Liu is expert in high quality film
preparations by molecular beam epitaxy in ultrahigh vacuum and in situ characterization by scanning probe microscopy. The magnetic anisotropy, magnetization reversal and exchange
bias in magnetic thin films are characterized by various techniques, such as magnetometry, magneto-transport and magneto-optics.

联系人:成昭华 研究员(8083)