Abstract
The enhancement of coercive field values depending on the measurement angle in a perpendicularly magnetized continuous thin film and the asymmetries in its hysteresis loops are analyzed and discussed by means of Hall effect measurements. Anomalous Hall effect and planar Hall effect contributions to the Hall results are separated to make the asymmetric loops symmetrical. The magnetic properties of the sample are also measured by using a vibrating sample magnetometer and magneto-optic Kerr effect methods. The data obtained by the measurement systems are compared, and the differences in their results are discussed. The results of the work highlight the importance of choosing the correct setup for the measurements and the importance of the measurement angle for the Hall effect studies in magnetic thin films.
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Baibich, M.N., Broto, J.M., Fert, A., Nguyen Van Dau, F., Petroff, F., Etienne, P., Creuzet, G., Friederich, A., Chazelas, J.: Giant magnetoresistance of (001)Fe/(001) Cr magnetic superlattices. Phys. Rev. Lett. 61(21), 2472–2475 (1988). https://doi.org/10.1103/PhysRevLett.61.2472
Binasch, G., Grunberg, P., Saurenbach, F., Zinn, W.: Enhanced magnetoresistance in layered magnetic structures with antiferromagnetic interlayer exchange. Phys. Rev. B. 39(7), 4828–4830 (1989). https://doi.org/10.1103/PhysRevB.39.4828
Manchon, A., Železný, J., Miron, I.M., Jungwirth, T., Sinova, J., Thiaville, A., Garello, K., Gambardella, P.: Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems. Rev. Mod. Phys. 91(3), 035004 (2019). https://doi.org/10.1103/RevModPhys.91.035004
Rowan-Robinson, R.M., Hindmarch, A.T., Atkinson, D.: Efficient current-induced magnetization reversal by spin-orbit torque in Pt/Co/Pt. J. Appl. Phys. 124(18), 183901 (2018). https://doi.org/10.1063/1.5046503
Neumann, L., Meinert, M.: Influence of the Hall-bar geometry on harmonic Hall voltage measurements of spin-orbit torques. AIP Adv. 8(9), 095320 (2018). https://doi.org/10.1063/1.5037391
Li, P., Liu, T., Chang, H., Kalitsov, A., Zhang, W., Csaba, G., Li, W., Richardson, D., DeMann, A., Rimal, G., Dey, H., Jiang, J.S., Porod, W., Field, S.B., Tang, J., Marconi, M.C., Hoffmann, A., Mryasov, O., Wu, M.: Spin-orbit torque-assisted switching in magnetic insulator thin films with perpendicular magnetic anisotropy. Nat. Commun. 7, (2016). https://doi.org/10.1038/ncomms12688
Gambardella, P., Miron, I.M.: Current-induced spin–orbit torques. Phil. Trans. R. Soc. A. 369(1948), 3175–3197 (2011). https://doi.org/10.1098/rsta.2010.0336
Ralph, D.C., Stiles, M.D.: Spin transfer torques. J. Magn. Magn. Mater. 320(7), 1190–1216 (2008). https://doi.org/10.1016/j.jmmm.2007.12.019
Garcia, D., Lou, P.C., Butler, J., Kumar, S.: Spin-orbit torque induced reversible coercivity change in Co/Pd multilayer thin films. Solid State Commun. 246, 1–4 (2016). https://doi.org/10.1016/j.ssc.2016.07.029
Ryu, J., Avci, C.O., Karube, S., Kohda, M., Beach, G.S.D., Nitta, J.: Crystal orientation dependence of spin-orbit torques in Co/Pt bilayers. Appl. Phys. Lett. 114(14), 142402 (2019). https://doi.org/10.1063/1.5090610
Garello, K., Miron, I.M., Avci, C.O., Freimuth, F., Mokrousov, Y., Blugel, S., Auffret, S., Boulle, O., Gaudin, G., Gambardella, P.: Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures. Nat. Nanotechnol. 8(8), 587–593 (2013). https://doi.org/10.1038/nnano.2013.145
Lin, P.-H., Yang, B.-Y., Tsai, M.-H., Chen, P.-C., Huang, K.-F., Lin, H.-H., Lai, C.-H.: Manipulating exchange bias by spin–orbit torque. Nat. Mater. 18(4), 335–341 (2019). https://doi.org/10.1038/s41563-019-0289-4
Cox, C.D.W., Caruana, A.J., Cropper, M.D., Morrison, K.: Anomalous Nernst effect in Co2MnSi thin films. J. Phys. D. Appl. Phys. 53(3), 035005 (2019). https://doi.org/10.1088/1361-6463/ab4eeb
Lee, K.-S., Lee, S.-W., Min, B.-C., Lee, K.-J.: Threshold current for switching of a perpendicular magnetic layer induced by spin Hall effect. Appl. Phys. Lett. 102(11), 112410 (2013). https://doi.org/10.1063/1.4798288
Zhang, F., Liu, Z., Wen, F., Liu, Q., Li, X., Ming, X.: Magnetoresistance and anomalous Hall effect with Pt spacer thickness in the spin-valve Co/Pt/[Co/Pt]2 multilayers. J. Supercond. Nov. Magn. 30(2), 533–538 (2017). https://doi.org/10.1007/s10948-016-3820-8
Li, F., Chen, F., Zhang, M., Zhang, K., Liu, W., Zhao, D., Yang, B.: Anomalous Hall effect in epitaxial Ni–Mn–Ga thin films grown on MgO(001) substrate during the martensitic transformation. J. Supercond. Nov. Magn. 32(10), 3183–3189 (2019). https://doi.org/10.1007/s10948-019-5073-9
Wang, R., Xiao, Z., Liu, H., Quan, Z., Zhang, X., Wang, M., Wu, M., Xu, X.: Enhancement of perpendicular magnetic anisotropy and spin-orbit torque in Ta/Pt/Co/Ta multi-layered heterostructures through interfacial diffusion. Appl. Phys. Lett. 114(4), 042404 (2019). https://doi.org/10.1063/1.5064643
Pan, C., An, H., Harumoto, T., Zhang, Z., Nakamura, Y., Shi, J.: Control of the perpendicular magnetic anisotropy and perpendicular exchange bias in CoPt/CoOx thin films. J. Magn. Magn. Mater. 484, 320 (2019). https://doi.org/10.1016/j.jmmm.2019.04.050
Hirohata, A., Frost, W., Samiepour, M., Kim, J.-y.: Perpendicular magnetic anisotropy in Heusler alloy films and their magnetoresistive junctions. Materials. 11(1), 105 (2018). https://doi.org/10.3390/ma11010105
Engel, C., Goolaup, S., Luo, F., Lew, W.S.: Characterizing angular dependence of spin-orbit torque effective fields in Pt/(Co/Ni)2/Co/IrMn structure. IEEE Trans. Magn. 53(11), 1–4 (2017). https://doi.org/10.1109/TMAG.2017.2704520
Tang, M., Zhang, Z., Jin, Q.: Manipulation of perpendicular exchange bias effect in [Co/Ni]N/(Cu, Ta)/TbCo multilayer structures. AIP Adv. 5(8), 087153 (2015). https://doi.org/10.1063/1.4929474
Elphick, K., O’Grady, K., Vallejo-Fernandez, G.: Perpendicular exchange Bias in (Co/Pt) n multilayers. IEEE Trans. Magn. 55(7), 1–6 (2019). https://doi.org/10.1109/TMAG.2019.2892205
Meiklejohn, W.H., Bean, C.P.: New magnetic anisotropy. Phys. Rev. 102(5), 1413–1414 (1956). https://doi.org/10.1103/PhysRev.102.1413
Hellwig, O., Maat, S., Kortright, J.B., Fullerton, E.E.: Magnetic reversal of perpendicularly-biased Co/Pt multilayers. Phys. Rev. B. 65(14), 144418 (2002). https://doi.org/10.1103/PhysRevB.65.144418
Demirci, E., Öztürk, M., Pişkin, H., Akdoğan, N.: Angle-dependent inverted hysteresis loops in an exchange-biased [Co/Pt]5/IrMn thin film. J. Supercond. Nov. Magn. 33(3), 721–726 (2020). https://doi.org/10.1007/s10948-019-05235-0
Öztürk, M., Demirci, E., Topkaya, R., Kazan, S., Akdoğan, N., Obaida, M., Westerholt, K.: Effect of exchange bias on magnetic anisotropies in Fe/CoO bilayers. J. Supercond. Nov. Magn. 1–7 (2011). https://doi.org/10.1007/s10948-011-1227-0
Sort, J., Baltz, V., Garcia, F., Rodmacq, B., Dieny, B.: Tailoring perpendicular exchange bias in [Pt/Co]-IrMn multilayers. Phys. Rev. B. 71(5), 054411 (2005). https://doi.org/10.1103/PhysRevB.71.054411
Maat, S., Takano, K., Parkin, S.S.P., Fullerton, E.E.: Perpendicular exchange Bias of Co/Pt multilayers. Phys. Rev. Lett. 87(8), 087202 (2001). https://doi.org/10.1103/PhysRevLett.87.087202
Zarefy, A., Lechevallier, L., Lardé, R., Chiron, H., Le Breton, J.M., Baltz, V., Rodmacq, B., Dieny, B.: Influence of Co layer thickness on the structural and magnetic properties of (Pt/CotCo)3/PttPt/IrMn multilayers. J. Phys. D. Appl. Phys. 43(21), 215004 (2010). https://doi.org/10.1088/0022-3727/43/21/215004
Ji, X., Pakhomov, A.B., Krishnan, K.M.: Asymmetric magnetic reversal of perpendicular exchange biased (Co∕Pt)5∕IrMn probed by magnetoresistance and magnetic force microscopy. J. Appl. Phys. 101(9), 09E507 (2007). https://doi.org/10.1063/1.2710227
Tsai, C.Y., Hsu, J.-H., Lin, K.F.: Perpendicular exchange bias behaviors of CoPt/IrMn and CoPt/FeMn bilayers: a comparative study. J. Appl. Phys. 117(17), 17D153 (2015). https://doi.org/10.1063/1.4919116
Demirci, E., Öztürk, M., Topkaya, R., Kazan, S., Akdoğan, N., Obaida, M., Westerholt, K.: Thickness and temperature dependence of exchange bias in Co/CoO bilayers. J. Supercond. Nov. Magn. 25(8), 2591–2595 (2012). https://doi.org/10.1007/s10948-011-1226-1
Czapkiewicz, M., Stobiecki, T., Rak, R., Zoladz, M., van Dijken, S.: Exchange bias energy in Co/Pt/IrMn multilayers with perpendicular and in-plane anisotropy. J. Magn. Magn. Mater. 316(2), 151–154 (2007). https://doi.org/10.1016/j.jmmm.2007.02.039
Bai, X.J., Shi, X.X., Cao, C.D., Yang, M., Zhang, W.X.: Subloop magnetic moment reversal-induced recovery effect in exchange-biased IrMn/Pt/Co/Pt multilayers. J. Supercond. Nov. Magn. 29(4), 905–910 (2016). https://doi.org/10.1007/s10948-015-3353-6
Letellier, F., Baltz, V., Lechevallier, L., Lardé, R., Jacquot, J.F., Rodmacq, B., Breton, J.M.L., Dieny, B.: Effects of sputter-deposition-induced and post-deposition thermally activated intermixing on the exchange bias properties of [Pt/Co]×3/(Pt)/IrMn films. J. Phys. D. Appl. Phys. 45(27), 275001 (2012). https://doi.org/10.1088/0022-3727/45/27/275001
Öztürk, M., Demirci, E., Erkovan, M., Öztürk, O., Akdoğan, N.: Coexistence of perpendicular and in-plane exchange bias using a single ferromagnetic layer in Pt/Co/Cr/CoO thin film. EPL. 114(1), 17008 (2016). https://doi.org/10.1209/0295-5075/114/17008
Öztürk, M., Akdoğan, N.: Design of a multifunctional sample probe for transport measurements. Turk. J. Phys. 42, 97–103 (2018). https://doi.org/10.3906/fiz-1702-6
Ogrin, F.Y., Lee, S.L., Ogrin, Y.F.: Investigation of perpendicular anisotropy of a thin film using the planar Hall effect. J. Magn. Magn. Mater. 219(3), 331–339 (2000). https://doi.org/10.1016/S0304-8853(00)00445-5
Kumar, S., Laughlin, D.E.: Methodology for investigating the magnetization process of the storage layer in double-layered perpendicular magnetic recording media using the anomalous Hall effect. IEEE Trans. Magn. 41(3), 1200–1208 (2005). https://doi.org/10.1109/TMAG.2004.843310
Osgood, R.M., Clemens, B.M., White, R.L.: Asymmetric magneto-optic response in anisotropic thin films. Phys. Rev. B. 55(14), 8990–8996 (1997). https://doi.org/10.1103/PhysRevB.55.8990
Akdogan, N., Rameev, B.Z., Dorosinsky, L., Sozeri, H., Khaibullin, R.I., Aktas, B., Tagirov, L.R., Westphalen, A., Zabel, H.: Anisotropy of ferromagnetism in Co-implanted rutile. J. Phys. Condens. Matter. 17(34), L359–L366 (2005). https://doi.org/10.1088/0953-8984/17/34/L01
Acknowledgments
The author thanks Bayram Kocaman for the technical support during the film depositions. The author would also like to acknowledge Bulat Rami for the fruitful discussions.
Funding
This work was supported by the research fund of the Gebze Technical University through the project no. BAP 2018-A105-43.
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Öztürk, M. Coercivity Enhancement and the Analysis of Asymmetric Loops in a Perpendicularly Magnetized Thin Film. J Supercond Nov Magn 33, 3097–3105 (2020). https://doi.org/10.1007/s10948-020-05564-5
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DOI: https://doi.org/10.1007/s10948-020-05564-5