Giant exchange anisotropy observed in Mn–Ir/Co–Fe bilayers containing ordered Mn3Ir phase

Imakita, Ken-ichi; Tsunoda, Masakiyo; Takahashi, Migaku
October 2004
Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3812
Academic Journal
Exchange anisotropy of Mn73Ir27/Co70Fe30 bilayers fabricated on a 50-nm-thick Cu under layer by changing the substrate temperature (Tsub) during the deposition of Mn–Ir layer was investigated, correlating with the crystallographic structure of Mn–Ir layer. The unidirectional anisotropy constant (JK) of the bilayers remarkably varied as a function of Tsub. After the thermal annealing of bilayers at 320 °C in a magnetic field of 1 kOe, JK steeply increased from 0.3 to 1.3 erg/cm2, as Tsub was raised from room temperature to 170 °C. The blocking temperature was enhanced from 270 to 360 °C, simultaneously. The JK of 1.3 erg/cm2 is nearly ten times larger than the values reported in Mn–Ir/Co–Fe bilayers early in the research of them. The x-ray diffraction profiles showed that the ordered Mn3Ir phase was formed in the antiferromagnetic layer with increasing Tsub. From the coincidence of enhancing JK and increasing peak intensity of superlattice diffraction lines, the Mn3Ir phase was suggested to be an origin of the giant JK and the high blocking temperature.


Related Articles

  • Structure and magnetic properties of the MnBi low temperature phase. Yang, J. B.; Yelon, W. B.; James, W. J.; Cai, Q.; Roy, S.; Ali, N. // Journal of Applied Physics;5/15/2002 Part 1, 2 & 3, Vol. 91 Issue 10, p7866 

    High purity MnBi low temperature phase has been prepared and analyzed using magnetic measurements and neutron diffraction. The low-temperature phase of the MnBi alloy has a coercivity μ[sub 0i]H[sub c] of 2.0 T at 400 K, and exhibits a positive temperature coefficient from 0 to at least 400...

  • Multiwave diffraction, phase problem, and extinction in imperfect crystals. Dmitrienko, V. E. // Crystallography Reports;Nov2009, Vol. 54 Issue 6, p937 

    The extinction effects of multiwave diffraction in imperfect crystals have been investigated. It is shown that the presence of extinction in the direct diffraction channel may lead to errors in determining the relative phases of structural amplitudes by the multiwave diffraction method (i.e., by...

  • Crystallographic properties of the MnGa2Se4 compound under high pressure. Marquina, J.; Power, Ch.; Grima, P.; Morocoima, M.; Quintero, M.; Couzinet, B.; Chervin, J. C.; Munsch, P.; González, J. // Journal of Applied Physics;11/1/2006, Vol. 100 Issue 9, p093513 

    X-ray diffraction measurements on MnGa2Se4, a II-III2-VI4 magnetic semiconductor compound, are made as a function of pressure up to 25 GPa. It is found that in the range of 0

  • Electrically switchable, polarization-independent diffraction grating based on negative dielectric anisotropy liquid crystal. Zhu, Minhua; Carbone, Giovanni; Rosenblatt, Charles // Applied Physics Letters;6/19/2006, Vol. 88 Issue 25, p253502 

    An atomic force microscope is used to scribe polymer-coated substrates to create an electrically controlled liquid crystal-based polarization grating. The grating is nondiffracting in the voltage-off state and diffracting in the voltage-on state. Based upon an optical phase difference of...

  • Spiral patterns in the anisotropy of acousto-optic figure of merit for LiNbO3 crystals: The case of anisotropic diffraction in the interaction plane XY. Mys O.; Kostyrko M.; Krupych O.; Vlokh R. // Ukrainian Journal of Physical Optics;2016, Vol. 17 Issue 1, p1 

    We have analyzed the anisotropy of acousto-optic figure of merit (AOFM) in LiNbO3 crystals for the three different types of anisotropic acousto-optic (AO) interactions associated with the interaction plane XY. The highest AOFM value (6.4x10-15 s³/kg) is reached for the type IX of anisotropic...

  • Refined Crystal Structure of Ca[B8O11(OH)4]–A Synthetic Calcium Analog of Strontioborite. Yamnova, N. A.; Egorov-Tismenko, Yu. K.; Zubkova, N. V.; Dimitrova, O. V.; Kantor, A. P. // Crystallography Reports;Sep2005, Vol. 50 Issue 5, p766 

    A calcium analog of strontioborite, namely, Ca[B8O11(OH)4], is synthesized under hydrothermal conditions (T = 270°C, P = 20 atm) within the framework of the study of the phase formation in the CaCl2 · Rb2CO3 · B2O3 system. The crystal structure of the synthetic calcium borate [a =...

  • Wide-aperture acousto-optic interaction in birefringent crystals. Voloshinov, V. B.; Mosquera, J. C. // Optics & Spectroscopy;Oct2006, Vol. 101 Issue 4, p635 

    Regularities of the wide-aperture mode of light diffraction by acoustic waves in crystals with different values of birefringence are considered. The diffraction has been investigated theoretically and experimentally with the aim of applying it in acousto-optic filters used in processing...

  • Crystallographic anisotropy of wear on a polycrystalline diamond surface. El-Dasher, Bassem S.; Gray, Jeremy J.; Tringe, Joseph W.; Biener, Juergen; Hamza, Alex V.; Wild, Christoph; Wörner, Eckhard; Koidl, Peter // Applied Physics Letters;6/12/2006, Vol. 88 Issue 24, p241915 

    We correlate topography and diffraction measurements to demonstrate that grain orientation profoundly influences polishing rates in polycrystalline diamond synthesized by chemical vapor deposition. Grains oriented with {111} or {100} planes perpendicular to the surface normal polish at...

  • Spin-Dependent Transport in α-MnS Single Crystals. Aplesnin, S. S.; Ryabinkina, L. I.; Abramova, G. M.; Romanova, O. B.; Kiselev, N. I.; Bovina, A. F. // Physics of the Solid State;Nov2004, Vol. 46 Issue 11, p2067 

    The electrical resistivity of single crystal α-MnS in crystallographic directions [111] and [100] was found to be anisotropic in the temperature interval 77–300 K. The change in activation energy below the Néel temperature was determined. Magnetoresistance was revealed, and reversal...


Read the Article


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

Try another library?
Sign out of this library

Other Topics