Relaxation times in exchange-biased nanostructures

Mejıa-López, José; Altbir, D.; Schuller, Iván K.
July 2003
Applied Physics Letters;7/14/2003, Vol. 83 Issue 2, p332
Academic Journal
We calculated the energy barrier, DE, for exchange-biased (EB) systems, using the ferromagnetic domain wall model. The temperature dependence of the EB is in good agreement with experimental results. For Fe-FeF[SUB2], Fe-MnF[SUB2], and Ni-NiO, ΔE is proportional to a power of the interfacial coupling constant and inversely to the ferromagnetic film thickness. The temperature and volume dependence of the relaxation time show that exchange coupling increases the superparamagnetic blocking temperature of nanostructured ferromagnets.


Related Articles

  • Domain structure of the antiferromagnetic insulating state in Nd[sub 0.5]Sr[sub 0.5]MnO[sub 3]. Shklyarevskiy, I. O.; Shvedun, M. Yu.; Gnatchenko, S. L.; van Bentum, P. J. M.; Cristianen, P. C. M.; Maan, J. C.; Kamenev, K. V.; Balakrishnan, G.; Paul, D. McK // Low Temperature Physics;Nov2001, Vol. 27 Issue 11, p923 

    Optical reflectivity studies of the ferromagnetic metal (FMM) to antiferromagnetic insulator (AFI) phase transition are performed on Nd[sub 0.5]Sr[sub 0.5]MnO[sub 3] manganite in a wide temperature and magnetic field range. The formation of a domain structure in the AFI state during the FMM-AFI...

  • Current-induced inverse population of spin subbands in magnetic junctions. Gulyaev, Yu.V.; Zil�berman, P.E.; Krikunov, A.I.; Panas, A.I; �phshtein, �.M. // JETP Letters;Mar2007, Vol. 85 Issue 3, p160 

    The spin flux matching conditions that should be satisfied at the boundaries between contacting layers of a magnetic junction to ensure the inverse population of spin subbands at experimentally achievable current densities of -107�108 A/cm2 are determined. The essence of the conditions is...

  • Giant domain walls in a ferromagnet. Zubov, V. E.; Kudakov, A. D.; Tsepelev, V. S. // JETP Letters;10/25/99, Vol. 70 Issue 8, p539 

    Giant domain walls with a width of ~7�m are observed on the surface of a ferromagnet � an amorphous magnetically soft alloy. A magnetooptic investigation shows that the walls have a N�el structure in the subsurface region. The subsurface structure of these walls differs...

  • Self-consistent domain theory in soft-ferromagnetic media. II. Basic domain structures in thin-film objects. van den Berg, H. A. M. // Journal of Applied Physics;8/1/1986, Vol. 60 Issue 3, p1104 

    Focuses on a study which developed a method for determining the domain structure in ideally soft-ferromagnetic cylindrical objects with plane-parallel top and bottom surfaces of arbitrary shape. Basic domain structures in simply connected objects; Domain structures in multiply connected media;...

  • Drift of domain walls of the ab type in weak ferromagnets. Gerasimchuk, V. S.; Shitov, A. A. // Low Temperature Physics;Dec2002, Vol. 28 Issue 12, p877 

    The drift motion of 180° domain walls of the ab type in a weak ferromagnet in an elastic stress field created by a sound wave propagating parallel or perpendicular to the plane of the domain wall is investigated. The dependence of the domain-wall drift velocity on the direction, amplitude,...

  • Integral relaxation time of single-domain ferromagnetic particles (abstract). Garanin, D.A. // Journal of Applied Physics;4/16/1997, Vol. 81 Issue 8, p4744 

    Presents an abstract of a study on the integral relaxation time of single-domain ferromagnetic particles. Use of the Fokker-Planck equation in calculating the longitudinal magnetic field; Competing contributions corresponding to the overbarrier and intrawell relaxation.

  • Low-temperature specific heat of TlCrS2. Aldzhanov, M. A.; Abdurragimov, A. A.; Sultanova, S. G.; Nadzhafzade, M. D. // Physics of the Solid State;Feb2007, Vol. 49 Issue 2, p320 

    The specific heat of the ferromagnetic semiconductor TlCrS2 is investigated experimentally, and the thermodynamic parameters are calculated. It is demonstrated that the temperature dependence of the magnetic specific heat of the TlCrS2 compound is characteristic of quasi-two-dimensional magnetic...

  • Self-consistent domain theory in soft ferromagnetic media. I. Solenoidal distributions in elliptical thin-film elements. van den Berg, H. A. M. // Journal of Applied Physics;3/15/1985, Vol. 57 Issue 6, p2168 

    Presents a study which explored the basic concepts of a self-consistent domain theory for the class of ideal soft ferromagnetic media. Kinds of electric devices in which soft ferromagnetic materials are being used; Discussion on two-dimensional magnetization distributions; Development of ideas...

  • Equation of motion of domain walls and equivalent circuits in soft ferromagnetic materials. Aguilar-Sahagun, G.; Quintana, P.; Amano, E.; Irvine, J. T. S.; Valenzuela, R. // Journal of Applied Physics;5/15/1994, Vol. 75 Issue 10, p7000 

    Deals with a study which measured the equation of motion for ferromagnetic domain walls with initial permeability measurements of cobalt-based soft ferromagnetic amorphous ribbons. Experimental details; Experimental results; Discussion; Conclusions.


Read the Article


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

Try another library?
Sign out of this library

Other Topics