Preparation and magnetic properties of hollow nano-spheres of cobalt and cobalt oxide: Drastic cooling-field effects on remnant magnetization of antiferromagnet

Yoshikawa, Hirofumi; Hayashida, Kenta; Kozuka, Yasuharu; Horiguchi, Asami; Awaga, Kunio; Bandow, Shunji; Iijima, Sumio
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5287
Academic Journal
We investigate the making of magnetic hollow spheres of Co3O4 (2) and fcc Co (3) with diameter 500 nm and thickness 40 nm, using polystyrene-bead templates. The spheres are characterized by scanning electron microscope, transmission electron microscope, electron diffraction, and x-ray diffraction. Magnetic measurements on 2 reveal a drastic enhancement of remnant magnetization below TN induced by cooling-field, while measurements on 3 indicate a soft ferromagnetism similar to that of bulk fcc Co.


Related Articles

  • Magnetic properties of antiferromagnetically coupled antidots of Co/Pd multilayers. Piramanayagam, S. N.; Ranjbar, M.; Tan, H. K.; Allen Poh, W. C.; Sbiaa, R.; Chong, T. C. // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p07B916 

    Antidots of Co/Pd multilayers with 3-bilayers [(Co/Pd)x3] that were antiferromagnetically coupled(AFC) to (Co/Pd)x10 were fabricated and their magnetic properties were investigated. The thickness of Co in (Co/Pd)x3 was varied from 0.4 to 0.8 nm. Samples with a Co thickness of 0.8 nm in the...

  • Effect of Surface Oxidation on the Magnetization Reversal of Cobalt Planar Wires. Chiang, C.; Ko, S.; Hsu, S. // Journal of Superconductivity & Novel Magnetism;Apr2013, Vol. 26 Issue 4, p1381 

    The influence of the antiferromagnetic layer of cobalt oxide on the magnetization reversal of a submicron cobalt planar wire was studied using the magneto-transport measurements. For pure Cobalt (Co) planar wires of width less than 1.2 μm, length of 30 μm, and thickness of 30 nm, the shape...

  • Probing Exchange Bias Properties of PtCo/Pt/CoO Films. Erkovan, M.; Aköz, M.; Öztürk, M.; Demirci, E.; Parlak, U.; Akdoğan, N.; Öztürk, O. // Journal of Superconductivity & Novel Magnetism;Jan2016, Vol. 29 Issue 1, p163 

    We present magnetic properties of bilayers consisting of antiferromagnetic CoO and ferromagnetic PtCo film structure on Si (001) as Pt/PtCo/Pt/CoO/Pt. The CoO layer and the PtCo layer thickness were kept constant (10 nm). In order to prevent PtCo ferromagnetic layer from oxidation, thin Pt (4...

  • Magnetic properties of ordered nanowires of the quasi-two-dimensional antiferromagnet SpFeMn(CO). Mushenok, F. B.; Dmitriev, A. I.; Kirman, M. V.; Aldoshin, S. M.; Sanina, N. A.; Morgunov, R. B. // Physics of the Solid State;Oct2010, Vol. 52 Issue 10, p2135 

    Ordered arrays of nanowires of the photochromic antiferromagnet SpFeMn(CO) (where Sp is 1-{(1′,3′,3′-trimethyl-6-nitro-5′-chlorospiro[2 H-1-benzopyran-2,2′-indolin]-8-yl)methyl}pyridinium) have been fabricated in anodized aluminum oxide pores with diameters of 20...

  • Antiferromagnetic iridium manganese based intermediate layers for perpendicular magnetic recording media. Srinivasan, Kumar; Piramanayagam, S. N.; Sbiaa, Rachid // Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p072503 

    Current generation CoCrPt oxide based perpendicular magnetic recording media use two Ru-based intermediate layers in order to grow crystallographically textured, and magnetically isolated granular media. In this work, the advantage of replacing the Ru grain isolation layer with antiferromagnetic...

  • Magnetic properties of Co50-xNixMn25Al25 alloys with B2 structure. Okubo, A.; Xu, X.; Umetsu, R. Y.; Kanomata, T.; Ishida, K.; Kainuma, R. // Journal of Applied Physics;Apr2011, Vol. 109 Issue 7, p07B114 

    Magnetic properties of the B2 phase in Co50-xNixMn25Al25 alloys were investigated. Spontaneous magnetization Ms measured at 4.2 K increases linearly with increasing x in the region of x ≤ 30 in accordance with following the generalized Slater-Pauling (GSP) line. However, Ms abruptly...

  • Magnetic Properties of GdCoAsO. Chen, Y.; Cui, Y.; Su, C.; Zhou, D.; Cheng, C.; Zhao, Y. // Journal of Superconductivity & Novel Magnetism;Jan2012, Vol. 25 Issue 1, p125 

    The magnetic properties of GdCoAsO have been investigated as a function of temperature and magnetic field. Complicated magnetism consists of antiferromagnetic, ferromagnetic, and paramagnetic has been observed. Most interestingly, magnetization measurements performed under low field, exhibit...

  • Magnetization pattern of ferromagnetic nanodisks. Raabe, J.; Pulwey, R.; Sattler, R.; Schweinbock, T.; Zweck, J.; Weiss[a], D. // Journal of Applied Physics;10/1/2000, Vol. 88 Issue 7, p4437 

    Studies the magnetization patter of cobalt (Co) and permalloy disks. Use of Lorentz microscopy and magnetic force microscopy in the study.

  • Destruction of magnetic frustration by a partial replacement of Ca by Gd in a spin chain compound Ca3Co2O6. Basu, Tathamay; Iyer, Kartik K.; Paulose, P. L.; Sampathkumaran, Echur V. // AIP Conference Proceedings;Feb2013, Vol. 1512 Issue 1, p1150 

    Frustrated spin-chain system Ca3Co2O6 has attracted a lot of attention in recent years due to the complex nature of magnetism. Here, we have investigated the influence of partial replacement of Ca ions intervening the spinchains by paramagnetic Gd ions on the exotic magnetic behaviour of this...


Read the Article


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

Try another library?
Sign out of this library

Other Topics