Center for Correlated Electron Systems

Seminar

Crafting and real-space imaging of non-collinear spin textures in multiferroic BiFeO3

September 24, 2019l Hit 548
Date : September 23, 2019 16:00 ~ 17:30
Speaker : Dr. Manuel Bibes(CNRS Research Director)
Location : Bldg. 19, Rm. 210

Bismuth ferrite (BiFeO 3 , BFO) is the most widely studied single phase multiferroic and one of the very few that is magnetic and ferroelectric at room temperature [1]. In the bulk, BFO is antiferromagnetic with a long-period spin cycloid that can be controlled by electric fields [2]. In this talk I will show how epitaxial strain can be used to tune the cycloid period, stabilize a new cycloid and transform it into a pseudo-collinear antiferromagnetic state [3,4]. I will first show data from macroscopic probes such as Mössbauer spectroscopy or Raman spectroscopy, and then explain how these spin orders can be imaged in real space using a new scanning probe technique called nitrogen-vacancy (NV) center microscopy [5]. In particular, NV microscopy supported by resonant elastic X-ray scattering brings insight into the spin textures at domain walls, where chiral magnetic objects form [6]. These results demonstrate how BFO can be used as a versatile platform for the design of reconfigurable nanoscale artificial spin textures.

 

[1]        D. Sando, A. Barthélémy, and M. Bibes, J. Phys. Condens. Matter 26, 473201 (2014).

[2]        D. Lebeugle et al, Phys. Rev. Lett. 100, 227602 (2008)

[3]        D. Sando et al., Nature Mater. 12, 641 (2013).

[4]        A. Agbelele et al., Adv. Mater. 29, 1602327 (2017).

[5]        I. Gross et al., Nature 549, 252 (2017).

[6]        J.-Y. Chauleau et al, Nature Mater. (in press)

 

 

Host: Prof. Tae Won Noh