Novel mechanism of photoinduced magnetism in organic-based magnetic semiconductor V(TCNE)x, x∼2

The organic-based magnet V(TCNE)x, x∼2 (Tc∼400K), is a room temperature magnetic semiconductor with spin polarized valence and conduction bands. It was reported that this material exhibits persistent photoinduced change in both magnetization and conductivity. The simultaneous change in IR spectra by illumination shows photoinduced activation to the metastable state with a small structural change. Here, we employed photoinduced ferrimagnetic resonance (FMR) study to investigate photoinduced magnetization in V(TCNE)x film. The FMR spectra display substantial changes in their linewidth and line shift by the illumination indicating substantial increase in random magnetic anisotropy. The results demonstrate optical control of magnetism by changing magnetic anisotropy of the system.

[1]  R. S. Edelstein,et al.  Photoinduced Magnetism and Random Magnetic Anisotropy in Organic-Based Magnetic Semiconductor V ( TCNE ) x Films, for x ∼ 2 , 2007 .

[2]  R. S. Edelstein,et al.  Multiple photonic responses in films of organic-based magnetic semiconductor V(TCNE)x, x∼2 , 2006 .

[3]  S. Erdin,et al.  Photoinduced magnetism caused by charge-transfer excitations in tetracyanoethylene-based organic magnets. , 2006, Physical review letters.

[4]  K. Hashimoto,et al.  Photoinduced magnetization with a high curie temperature and a large coercive field in a cyano-bridged cobalt-tungstate bimetallic assembly. , 2006, Journal of the American Chemical Society.

[5]  M. Fahlman,et al.  X-ray magnetic circular dichroism and resonant photomission of V(TCNE)x hybrid magnets. , 2006, Physical review letters.

[6]  A. Epstein,et al.  Ferrimagnetic resonance in films of vanadium [tetracyanoethanide] x, grown by chemical vapor deposition , 2004 .

[7]  George Srajer,et al.  Local structural order in the disordered vanadium tetracyanoethylene room-temperature molecule-based magnet , 2004 .

[8]  A. Epstein,et al.  Anomalous magnetoresistance in high-temperature organic-based magnetic semiconducting V(TCNE) x films , 2003 .

[9]  Vladimir N. Prigodin,et al.  Spin-Driven Resistance in Organic-Based Magnetic Semiconductor V[TCNE]x , 2002 .

[10]  A. Epstein,et al.  Photoinduced magnetization in the organic-based magnet Mn(TCNE)(x)* y(CH2Cl2). , 2002, Physical review letters.

[11]  A. Caneschi,et al.  Isotopic effect on the quantum tunneling of the magnetization of molecular nanomagnets , 2001 .

[12]  Epstein,et al.  Photoinduced magnetism, dynamics, and cluster glass behavior of a molecule-based magnet , 2000, Physical review letters.

[13]  A. Epstein,et al.  Thin-film V[TCNE]x magnets , 2000 .

[14]  A. Fujishima,et al.  DESIGN AND PREPARATION OF A NOVEL MAGNET EXHIBITING TWO COMPENSATION TEMPERATURES BASED ON MOLECULAR FIELD THEORY , 1999 .

[15]  A. Fujishima,et al.  Photoinduced Magnetization of a Cobalt-Iron Cyanide , 1996, Science.

[16]  S. M. Long,et al.  Electron Spin Resonance Study of the Disorder in the V(TCNE)x·y(MeCN) High-Tc Molecule-Based Magnet , 1995 .

[17]  A. Epstein,et al.  A Room-Temperature Molecular/Organic-Based Magnet , 1991, Science.

[18]  M. Salamon,et al.  Ferromagnetic resonance in a Ni-Mo superlattice , 1984 .

[19]  K. Becker.  Theory of electron-spin-resonance linewidth and line-shift effects in spin-glasses with anisotropy and zero remanent magnetization , 1982 .