Room-temperature ferromagnetism in ion-implanted Co-doped TiO2(110) rutile

Shutthanandan, V.; Thevuthasan, S.; Heald, S. M.; Droubay, T.; Engelhard, M. H.; Kaspar, T. C.; McCready, D. E.; Saraf, L.; Chambers, S. A.; Mun, B. S.; Hamdan, N.; Nachimuthu, P.; Taylor, B.; Sears, R. P.; Sinkovic, B.
May 2004
Applied Physics Letters;5/31/2004, Vol. 84 Issue 22, p4466
Academic Journal
Ferromagnetic Co-doped rutile TiO2 single crystals were synthesized by high-temperature ion implantation and characterized by a variety of techniques. Co is uniformly distributed to a depth of ∼300 nm with an average concentration of ∼2 at. %, except in the near-surface region, where the concentration is ∼3 at. %. Ferromagnetic behavior is exhibited at room temperature with an effective saturation magnetization of ∼0.6 μB/Co atom. The Co is in a formal oxidation state of +2 throughout the implanted region, and no Co(O) is detected. © 2004 American Institute of Physics.


Related Articles

  • Isothermal tuning of exchange bias using pulsed fields. Nogués, J.; Sort, J.; Suriñach, S.; Muñoz, J. S.; Baró, M. D.; Bobo, J. F.; Lüders, U.; Haanappel, E.; Fitzsimmons, M. R.; Hoffmann, A.; Cai, J. W. // Applied Physics Letters;5/5/2003, Vol. 82 Issue 18, p3044 

    Exchange bias, H[sub E],, and coercivity, H[sub C], of antiferromagnetic (AFM)/ferromagnetic bilayers can be adjusted, after deposition, at temperatures below the Néel temperature of the AFM by subjecting the samples to large pulsed fields (in excess of H[sub Pulse] = 550 kOe). The efficiency...

  • Nature of short-range ferromagnetic ordered state above TC in double perovskite La2NiMnO6. Zhou, S. M.; Guo, Y. Q.; Zhao, J. Y.; Zhao, S. Y.; Shi, L. // Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p262507 

    Magnetic measurements of La2NiMnO6 reveal that its inverse susceptibility exhibits an upward derivation from Curie–Weiss behavior above TC, indicating the presence of a short-range ferromagnetic ordered state. It is suggested that the upward derivation is due to antiferromagnetic...

  • Positive and negative exchange bias effects in the simple perovskite manganite NdMnO3. Hong, Fang; Cheng, Zhenxiang; Wang, Jianli; Wang, Xiaolin; Dou, Shixue // Applied Physics Letters;9/3/2012, Vol. 101 Issue 10, p102411 

    Exchange bias effects were studied in the simple perovskite NdMnO3. Nd3+ ordering is induced by the Mn3+ ferromagnetic component, and they are antiferromagnetically coupled with each other. At 30 K, both negative and positive exchange bias effects are found, which are dependent on the cooling...

  • Ferromagnetism of Metallic Compounds with the Perovskite Structure. Zaĭtsev, R. O. // JETP Letters;8/10/2005, Vol. 82 Issue 3, p155 

    On the basis of the concept of strong interaction in one unit cell, it is stated that ferromagnetic instability can occur in a system with hops between oxygen anions and transition metal (Me) cations in A1 – xBxMeO3 compounds. A phase diagram is constructed to describe the occurrence of...

  • Antiferromagnetic impurity states in a semi-infinite ferromagnet for various orientations of the surface relative to the crystal axes. Petrova, T. G. // Low Temperature Physics;Feb2001, Vol. 27 Issue 2, p143 

    A study is made of spin states localized on an antiferromagnetic impurity found on the surface or in one of subsurface layers of a semi-infinite Heisenberg ferromagnet. Different orientations of the surface relative to the axes of the crystal are considered. The energies and eigenfunctions of...

  • Defect-modified exchange bias. Kim, Joo-Von; Stamps, R. L. // Applied Physics Letters;10/22/2001, Vol. 79 Issue 17, p2785 

    The influence of local defects in exchange biased ferromagnetic/antiferromagnetic bilayers is studied using numerical simulations. The location of defects relative to the interface is found to be the main factor determining the magnitude of coercive and bias field modifications. One consequence...

  • Novel method for determining the anisotropy constant of MnFe in a NiFe/MnFe sandwich. Mauri, Daniele; Kay, Eric; Scholl, David; Howard, J. Kent // Journal of Applied Physics;10/1/1987, Vol. 62 Issue 7, p2929 

    Presents a study that developed an in situ Kerr rotation measurement method for examining antiferromagnetic (AF) and ferromagnetic (F) film couples. Background on the measurement of the physical manifestation of exchange coupling between an AF and an F; Analysis of the exchange field; Results...

  • Theory of two-dimensional antiferromagnets with a nearly critical ground state (abstract). Chubukov, Andrey V.; Sachdev, Subir // Journal of Applied Physics;5/15/1994, Vol. 75 Issue 10, p6345 

    Presents an abstract of a study that presented a general theory of clean, two-dimensional, quantum Heisenberg antiferromagnets which are close to the zero-temperature quantum transition between ground states with and without long-range Néel order.

  • The dilute quantum Heisenberg antiferromagnet. Wan, C. C.; Harris, A. B.; Adler, Joan // Journal of Applied Physics;4/15/1991, Vol. 69 Issue 8, p5191 

    Presents a study that examined dilute quantum Heisenberg antiferromagnet using series expansions. Background on series expansion; Determination of the threshold concentration of the antiferromagnet; Estimation of the crossover exponent of the antiferromagnet.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics