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Frustrated minority spins in GeNi<sub>2</sub>O<sub>4</sub>
Matsuda, M.,Chung, J.-H.,Park, S.,Sato, T. J.,Matsuno, K.,Aruga Katori, H.,Takagi, H.,Kakurai, K.,Kamazawa, K.,Tsunoda, Y.,Kagomiya, I.,Henley, C. L.,Lee, S.-H. Editions de Physique 2008 Europhysics letters Vol.82 No.3
<P>Recently, two consecutive phase transitions were observed, upon cooling, in an antiferromagnetic spinel GeNi<SUB>2</SUB>O<SUB>4</SUB> at <I>T</I><SUB><I>N</I>1</SUB>=12.1 K and <I>T</I><SUB><I>N</I>2</SUB>=11.4 K, respectively (Crawford M. K. <I>et al</I>., <I>Phys. Rev. B</I>, <B>68</B> (2003) 220408(R)). Using unpolarized and polarized elastic neutron scattering we show that the two transitions are due to the existence of frustrated minority spins in this compound. Upon cooling, at <I>T</I><SUB><I>N</I>1</SUB> the spins on the 〈111〉 kagome planes order ferromagnetically in the plane and antiferromagnetically between the planes (phase I), leaving the spins on the 〈111〉 triangular planes that separate the kagome planes frustrated and disordered. At the lower <I>T</I><SUB><I>N</I>2</SUB>, the triangular spins also order in the 〈111〉 plane (phase II). We also present a scenario involving exchange interactions that qualitatively explains the origin of the two purely magnetic phase transitions.</P>
Angular Dependence of Exchange Bias and Coercive Field in CoFe/MnIr Epitaxial Bilayers
Kim, D.Y.,Kim, C.G.,Kim, C.-O.,Shibata, M.,Tsunoda, M.,Takahashi, M.,Kim, D.Y.,Kim, C.G.,Kim, C.-O.,Shibata, M.,Tsunoda, M.,Takahashi, M. IEEE 2005 IEEE transactions on magnetics Vol.41 No.10
We have measured the hysteresis loop and torque curves at various applied magnetic field angle in CoFe/MnIr epitaxial bilayers on single crystal MgO
Interlayer and Interfacial Exchange Coupling of IrMn Based MTJ
J. Wrona,T. Stobiecki,M. Czapkiewicz,J. Kanak,R. Rak,M. Tsunoda,M. Takahashi 한국자기학회 2004 Journal of Magnetics Vol.9 No.2
As deposited and annealed MTJs with the structure of Ta(5 ㎚)/Cu(10 ㎚)/Ta(5 ㎚)/Ni_(80)Fe_(20)(2 ㎚)/Cu(5 ㎚)/Ir_(25)Mn_(7.5)(10 ㎚)/Co_(70)Fe_(30)(2.5 ㎚)/Al-O/Co_(70)Fe_(30)(2.5 ㎚)/Ni_(80)Fe_(20)(t)/Ta(5 ㎚), where t = 10, 30, 60 and 100 ㎚ were characterized by XRD and magnetic hysteresis loops measurements. The XRD measurements were done in grazing incidence (GID scan-2θ) and θ-2θ geometry, by rocking curve (scan-ω) and pole figures in order to establish correlation between texture and crystallites size and magnetic parameters of exchange biased and interlayer coupling. The variations of shifting and coercivity field of free and pinned layers after annealing in 300℃ correlate with the improvement of [111] texture and grains size of Ni_(80)Fe_(20) and Ir_(25)Mn_(75) respectively. The exchange biased and the coercivity fields of the pinned layer linearly increased with increasing grain size of Ir_(25)Mn_(75). The reciprocal proportionality between interlayer coupling and coercivity fields of the free layer and grain size of Ni_(80)Fe_(20) was found. The enhancement of interlayer coupling between pinned and free layers, after annealing treatment, indicates on the correlated in-phase roughness of dipolar interacting interfaces due to increase of crystallites size of Ni_(80)Fe_(20).