List of Publications of Julian Geshev, Ph.D.
Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil

2009

G. M. B. Castro, J. Geshev, J. E. Schmidt, E. B. Saitovich, and L. C. C. M. Nagamine, "Cone magnetization state and exchange bias in IrMn/Cu/[Co/Pt]3 multilayers," Journal of Applied Physics  106 (2009) 113922. 
F. Rigato, J. Geshev, V. Skumryev, and J. Fontcuberta, "The magnetization of epitaxial nanometric CoFe2O4(001) layers," Journal of Applied Physics 106 (2009) 113924. 
R. Cichelero, L. G. Pereira, T. Dias, J. E. Schmidt, C. Deranlot, F. Petroff, and J. Geshev, "Engineering double-shifted hysteresis loops in Co/IrMn/Cu/Co films," Applied Physics Letters 95 (2009) 112501. 
M. Cougo dos Santos, J. Geshev, L. G. Pereira, and J. E. Schmidt, "Magnetic-field-dependent morphology of self-organized Fe on stepped Si(111) surfaces," Journal of Applied Physics 106 (2009) 023904. 
J. Geshev, 'Comment on "Exchange bias in the layered cobaltite Sr1.5Pr0.5CoO4",' Journal of Applied Physics 105 (2009) 066108. 
J. Geshev, S. Nicolodi, R. B. da Silva, J. Nogués, V. Skumryev, and M. D. Baró, "Discrimination between coupling and anisotropy fields in exchange-biased bilayers," Journal of Applied Physics 105(5) (2009) 053903. 
J. Geshev, "Comment on 'Particle size dependent exchange bias and cluster-glass states in LaMn0.7Fe0.3O3'," Journal of Physics: Condensed Matter 21 (2009) 078001. 
2008
D. Schafer, J. Geshev, S. Nicolodi, L. G. Pereira, J. E. Schmidt, and P. L. Grande, "Controlled rotation of the exchange-bias direction in IrMn/Cu/Co via ion irradiation," Applied Physics Letters 93 (2008) 042501. 
J. Geshev, 'Comment on "Cluster glass induced exchange biaslike effect in the perovskite cobaltites" [Appl. Phys. Lett. 90, 162515 (2007)],' Applied Physics Letters 93 (2008) 176101. 
J. Geshev, S. Nicolodi, L. G. Pereira, J. E. Schmidt, V. Skumryev, S. Suriñach, and M. D. Baró, "Impact of magnetization easy-axis distributions on the ferromagnet-antiferromagnet exchange coupling estimation," Physical Review B 77 (2008) 132407. DOI
L. C. C. M. Nagamine, G. M. B. Castro, J. Geshev, M. N. Baibich, E. B. Saitovitch, and J. E. Schmidt, "Magnetoresistance and magnetization studies through a Cu interlayer in spin valves of NiFe/Cu/NiFe/FeMn," Journal of Magnetism and Magnetic Materials 320 (2008) e16. DOI
I. L. Graff, J. Geshev, S. R. Teixeira, L. Amaral, and A. Traverse, "Atomic level mixing induced by Kr irradiation of FeCo/Cu multilayers," Journal of Applied Physics 103 (2008) 033505. DOI
J. Geshev, L. G. Pereira, and V. Skumryev, 'Comment on "Exchange Bias Dependence on Interface Spin Alignment in a Ni80Fe20/(Ni,Fe)O Thin Film'',' Physical Review Letters 100 (2008) 039701.
L. C. C. M. Naganime, J. Geshev, J. B. M. da Cunha, A. Biondo, E. B. Saitovitch, "Magnetic anisotropy of the ultrathin Fe layers in Fe/NiFe/Fe/Cu multilayers and their effect to the magnetoresistance," Thin Solid Films 516 (2008) 1279. DOI
J. Geshev, 'Comment on "Exchange bias and vertical shift in CoFe2O4 nanoparticles" [J. Magn. Magn. Mater. 313 (2007) 266],' Journal of Magnetism and Magnetic Materials 320 (2008) 600.

2007

G. Goev, V. Masheva, M. Mikhov, and J. Geshev, "Irreversible susceptibility of initial magnetization curve defined by energy consideration," International Journal of Modern Physics B 21(21) (2007) 3707.
J. Geshev, S. Nicolodi, L. G. Pereira, L. C. C. M. Nagamine, J. E. Schmidt, C. Deranlot, F. Petroff, R. L. Rodríguez-Suárez, and A. Azevedo, "Exchange bias through a Cu interlayer in IrMn/Co system," Physical Review B 75 (2007) 214402. DOI
S. Nicolodi, L. C. C. M. Nagamine, A. D. C. Viegas, J. E. Schmidt, L. G. Pereira, C. Deranlot, F. Petroff, and J. Geshev, "Copper spacer thickness dependence of the exchange bias in IrMn/Cu/Co ultrathin films," Journal of Magnetism and Magnetic Materials 316 (2007) e97. DOI
G. Goev, V. Masheva, J. Geshev and M. Mikhov, "Irreversible susceptibility of initial magnetization curve," AIP Conference Proceedings 899(1) (2007) 251.
I. L. Graff, A. Traverse, J. Geshev S. R. Teixeira, and L. Amaral, "Magnetic and structural behavior of FeCo/Cu multilayers submitted to Kr irradiation," Nuclear Instruments and Methods in Physics Research B 257 (2007) 424. DOI
P. Migowski, S. R.Teixeira, G. Machado, M. C. M. Alves, J. Geshev and J. Dupont, "Structural and Magnetic Characterization of Ni Nanoparticles Synthesized in Ionic Liquids," Journal of Electron Spectroscopy and Related Phenomena 156-158 (2007) 195. DOI 

2006

L. C. C. M. Nagamine, J. E. Schmidt, M. N. Baibich, E. B. Saitovitch, and J. Geshev, "Field-dependent anisotropic magnetoresistance and magnetization measurements of NiFe/FeMn exchange-biased bilayers," Physica B: Condensed Matter 384(1-2) (2006) 132. DOI 
J. G. Borges, P. Prod’homme, F. Maroun, R. Cortès, J. Geshev, J. E. Schmidt, and P. Allongue, "Perpendicular anisotropy in electrodeposited Au/Co films," Physica B: Condensed Matter 384(1-2) (2006) 138. DOI 
S. Nicolodi, L. G. Pereira, J. E. Schmidt, L. C. C. M. Nagamine, A. D. C. Viegas, C. Deranlot, F. Petroff, and J. Geshev, "Angular dependence of the exchange bias and coercivity of IrMn/Co bilayers," Physica B: Condensed Matter 384(1-2) (2006) 141. DOI 
J. Geshev, M. Cougo dos Santos, L. F. Zagonel, L. G. Pereira, and J. E. Schmidt, "Magnetization switching in vicinal (111) iron and cobalt thin films," Physica B: Condensed Matter 384(1-2) (2006) 135. DOI 

2005

M. Carara, K.D. Sossmeier, A.D.C. Viegas, J. Geshev, H. Chiriac, and R.L. Sommer, "Study of CoFeSiB glass-covered amorphous microwires under applied stress," Journal of Applied Physics 98(3), (2005) 033902. DOI 
E. Fonda, S. R. Teixeira, J. Geshev, D. Babonneau, F. Pailloux, and A. Traverse, "Negative differential magnetization in Ni nanoparticles embedded in Al," Physical Review B 71(18), (2005) 184411. DOI
L. C. C. M. Nagamine, J. Geshev, T. Menegotto, A. A. R. Fernandes, A. Biondo, and E. B. Saitovitch, “Ferromagnetic resonance and magnetization studies in exchange-coupled NiFe/Cu/NiFe structures,“ Journal of Magnetism and Magnetic Materials 288, (2005) 205. DOI 

2004

M. Cougo dos Santos, J. Geshev, L.G. Pereira, M. C. M. Alves, J. E. Schmidt, and P. Allongue, “Intralayer coupling in self-organized Fe nanoclusters grown on vicinal Si(111),“ Physical Review B  70(10), (2004) 104420. DOI 
J. Geshev, L. G. Pereira, and J. E. Schmidt, “Comment on "Thickness dependence of exchange bias and coercivity in a ferromagnetic layer coupled with an antiferromagnetic layer" [J. Appl. Phys. 94, 2529 (2003)],“ Journal of Applied Physics 96(3), (2004) 1763.  
C. Driemeier, L. C. C. M. Nagamine, J. E. Schmidt, and J. Geshev,“Tuning the Antiferromagnetic Easy Axis Direction in Exchange Bias Bilayers,“ Journal of Magnetism and Magnetic Materials 272-276S (2004) E811. DOI 
A. Staneva, E. Gattef, Y. Dimitriev, M. Mikhov, and J. Geshev, “Magnetic materials containing LaSr manganite phase,“ Solid State Sciences 6(1), (2004) 47. DOI

2003

M. Cougo dos Santos, J. Geshev, D. K. Silva, J. E. Schmidt, L. G. Pereira, R. Hubler, P. Allongue, “Strong dependence of the Fe thin film magnetic anisotropy on the Si(111) substrate preparation,“ Journal of Applied Physics 94(3), (2003) 1490. DOI
J. Geshev, L.G. Pereira, J.E. Schmidt, L.C.C.M. Nagamine, E. B. Saitovitch, and F. Pelegrini, “Frequency dependent exchange bias in NiFe/NiO films,“ Physical Review B 67(13), (2003) 132401. DOI 

2002

J. Geshev, L.G. Pereira and J.E. Schmidt, “Rotatable anisotropy and coercivity in exchange-bias bilayers,“ Physical Review B 66(13), (2002) 134432. DOI
J. Geshev, L.G. Pereira and J.E. Schmidt, “Dependence of the ferromagnetic resonance modes on the coupling strength in exchange-coupled trilayer structures,“ Physica B 320(1-4), (2002) 169. DOI
M.A.S. Boff, J. Geshev, J.E. Schmidt, W.H. Flores, A.B. Antunes, M.A. Gusmão, and S.R. Teixeira, “Bias dependence of magnetoresistance in Fe-Al2O3 granular thin films,“ Journal of Applied Physics 91(12), (2002) 9909. DOI

2001

J. Geshev, L.G. Pereira, J.E. Schmidt and M. Mikhov, “Dependence of the magnetization and remanence of single domain particles on the second cubic anisotropy constant,“ Journal of Applied Physics 90(12), (2001) 6243. DOI
J. Geshev, L.G. Pereira and J.E. Schmidt, “Angular dependence of the exchange bias obtained from magnetization and ferromagnetic resonance measurements in exchange-coupled bilayers,“ Physical Review B 64, (2001) 184411. DOI
J. Geshev, A. Morrone and J.E. Schmidt, "Multi-state perpendicular remanence in Co/Pd multilayers," Journal of Magnetism and Magnetic Materials, 226-230, (2001) 1711. DOI 

2000

J. Geshev, “Analytical solutions for exchange bias and coercivity in ferromagnetic/antiferromagnetic bilayers,“ Physical Review B, 62(9), (2000) 5627. DOI
M. Cougo dos Santos, J. Geshev, J.E. Schmidt, S.R. Teixeira and L.G. Pereira, “Origin of the Magnetization Reversal of an Fe Thin Film on Si(111),“ Physical Review B  61(2), (2000) 1311. DOI

1999

J. Geshev, M. Mikhov and J.E. Schmidt, “Remanent Magnetization Plots of Fine Particles with Competing Cubic and Uniaxial Anisotropies,“Journal of Applied Physics 85(10), (1999) 7321. DOI
J. Geshev, A.D.C. Viegas and J.E. Schmidt, “ Unusual Remanent Magnetization of Granular Co/Cu,“ Journal of Magnetism and Magnetic Materials 196 (1), (1999) 126. DOI
V. Masheva, M. Grigorova, N. Valkov, H.J. Blythe, T. Midlarz, V. Blaskov, J. Geshev and M. Mikhov , “On the Magnetic Properties of Nanosized CoFe2O4,“Journal of Magnetism and Magnetic Materials 196(1), (1999) 128. DOI
J. Geshev, Ll. Martinez, J.S. Muñoz, J.E. Schmidt and M. Mikhov, “Evaluation of the Anisotropy Field for Fine-Particle Systems from Low-Field Thermomagnetic Curves,” IEEE Transactions on Magnetics  35(2), (1999) 1019. DOI 

1998

J. Geshev, A.D.C. Viegas and J.E. Schmidt, “Negative Remanent Magnetization of Fine Particles with Competing Cubic and Uniaxial Anisotropies,“ Journal of Applied Physics 84(3), (1998) 1488. DOI
W.H. Flores, S.R. Teixeira, J. Geshev, J.B.M. da Cunha, P.J. Schilling, A. Traverse and M.C. Martins Alves, “Structural Evolution and Magnetic Behaviour of Co/Ag Multilayers Submitted to Thermal Annealing,“ Journal of Magnetism and Magnetic Materials 188(1-2), (1998) 17. DOI
A.D.C. Viegas, J. Geshev, J.E. Schmidt and E.F. Ferrari, “Giant Magnetoresistance and Remanence in Granular CoCu Codeposited films,“Journal of Applied Physics  83(11), (1998) 7007. DOI

1997

A.D.C. Viegas, J. Geshev, L.S. Dorneles, J.E. Schmidt and M. Knobel, “Correlation Between Magnetic Interactions and Giant Magnetoresistance in Melt-Spun Co10Cu90 Granular Alloys,“ Journal of Applied Physics 82(6), (1997) 3047. DOI
A.D.C. Viegas, J. Geshev, L.F. Schelp and J.E. Schmidt, “Correlation Between Giant Magnetoresistance and Magnetic Interactions in a CoAg Multilayered/Granular System,“ Journal of Applied Physics 82(5), (1997) 2466. DOI
J. Geshev, L. Bozukov, J.M.D. Coey and M. Mikhov, “Hysteresis of Ball-Milled TbFe2 Fine Particles,“ Journal of Magnetism and Magnetic Materials 170, (1997) 219. DOI 
J. Geshev and J.E. Schmidt, “Interaction Fields Evaluation in Fine Particle Systems,“ IEEE Transactions on Magnetics 33(4), (1997) 2504. DOI 
A.D.C. Viegas, J. Geshev, L.S. Dorneles, J.E. Schmidt and M. Knobel, “Giant Magnetoresistance and Magnetic Interactions in Granular Co10Cu90,“ in: Magnetic Hysteresis in Novel Magnetic Materials, Ed. G.C. Hadjipanayis, (Kluwer Academic Publishers, Dordrecht, The Netherlands, 1997). NATO ASI Series E: Applied Sciences, vol. 338, pp. 413. 

1995

V. Masheva, J. Geshev and M. Mikhov, “The Influence of the Second Anisotropy Constant on the Fourier Description of Hysteresis Loops for a Stoner-Wohlfarth System,“ Journal of Magnetism and Magnetic Materials 140-144, (1995) 371. DOI 

1994

V. Masheva, J. Geshev and M. Mikhov, “Fourier Analysis of Magnetization Curves,“ Proc. Suppl. Balkan Physics Letters 2, (1994) 522-526. 
J. Geshev, M. Mikhov and C. Sorensen, “Hopkinson Effect in Fine Particle Systems with Cubic Anisotropy,“ Proc. Suppl. Balkan Physics Letters 2, (1994) 330-333.
V. Masheva, J. Geshev and M. Mikhov, “Fourier Analysis of Hysteresis Loops and Initial Magnetization Curves. Application to the Singular-Point-Detection Method,“ Journal of Magnetism and Magnetic Materials 137, (1994) 350, DOI
M. Mikhov, J. Geshev and V. Masheva, “Anisotropy Field and Interparticle Interactions Determined by Fourier Analysis of Magnetization Curves of Small Particles,“ in: Nanophase Materials, Eds. G.C. Hadjipanayis and R.W. Siegel, (Kluwer Academic Publishers, Dordrecht, The Netherlands, 1994) NATO ASI Series E: Applied Sciences, vol. 260, pp. 699-702. 
J. Geshev, V. Masheva and M. Mikhov, “Interaction Effects Detected by Fourier Analysis of Hysteresis Loops and Initial Magnetization Curves,“ IEEE Transactions on Magnetics 30(2), (1994) 863. DOI 

1992

J. Geshev, O. Popov, M. Mikhov, J.L. Sanchez Ll., N. Suarez and F. Leccabue, “The Hopkinson Effect in a Fine BaFe12O19 Particle System: Demagnetization Field Effects,“ Journal of Magnetism and Magnetic Materials 117, (1992) 190. DOI 
J. Geshev and M. Mikhov, “Remanence Curves for a Disordered System of Three- and Four-Axial Fine Particles. Henkel-Type Plots,“ Journal of Magnetism and Magnetic Materials 104-107, (1992) 1569. DOI 

1990

J. Geshev, O. Popov, V. Masheva and M. Mikhov, “Thermomagnetic Curves for a Disordered System of Single Domain Ferromagnetic Particles with Cubic Anisotropy,“ Journal of Magnetism and Magnetic Materials 92, (1990) 185. DOI