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論文

Mn$$_{2}$$VAl Heusler alloy thin films; Appearance of antiferromagnetism and exchange bias in a layered structure with Fe

土屋 朋生*; 小林 亮太*; 窪田 崇秀*; 斉藤 耕太郎*; 小野 寛太*; 大原 高志; 中尾 朗子*; 高梨 弘毅*

Journal of Physics D; Applied Physics, 51(6), p.065001_1 - 065001_7, 2018/02

 被引用回数:1 パーセンタイル:100(Physics, Applied)

Mn$$_{2}$$VAl Heusler alloy films were epitaxially grown on MgO(100) single-crystal substrates by ultra-high-vacuum magnetron sputtering. A2- and L21-type Mn$$_{2}$$VAl order was controlled by the deposition temperature. A2-type Mn$$_{2}$$VAl films showed no spontaneous magnetization, while L21-type Mn$$_{2}$$VAl films showed ferrimagnetic behaviour with a maximum saturation magnetization of 220 emu/cm$$^{3}$$ at room temperature (RT). An antiferromagnetic reflection was observed with neutron diffraction at RT for an A2-type Mn$$_{2}$$VAl film deposited at 400$$^{circ}$$C. A bilayer sample of the antiferromagnetic A2-type Mn$$_{2}$$VAl and Fe showed an exchange bias of 120 Oe at 10 K.

論文

Influence of electron doping on magnetic order in CeRu$$_2$$Al$$_{10}$$

小林 理気*; 金子 耕士; 斉藤 耕太郎*; Mignot, J.-M.*; Andr$'e$, G.*; Robert, J.*; 脇本 秀一; 松田 雅昌*; Chi, S.*; 芳賀 芳範; et al.

Journal of the Physical Society of Japan, 83(10), p.104707_1 - 104707_5, 2014/10

 被引用回数:12 パーセンタイル:26.29(Physics, Multidisciplinary)

The effect of electron doping by the substitution of Rh for Ru on unconventional magnetic order in CeRu$$_2$$Al$$_{10}$$ was investigated via neutron powder diffraction. In Ce(Ru$$_{1-x}$$Rh$$_x$$)$$_2$$Al$$_{10}$$ with $$x$$ = 0.05, 0.12, 0.2, reorientation of the ordered moment from the $$c$$- to the $$a$$-axis takes place in all samples, while the ordering vector $$q$$ = (0 1 0) remains unchanged within this concentration range. The moment reorientation is accompanied by an enhancement in its size by a factor of 2.4, from $${mu}$$=0.43 $${mu}_B$$ at $$x$$ = 0 to $${mu}$$=1.06, 1.04, and 1.02 $${mu}_B$$ for $$x$$ = 0.05, 0.12 and 0.2, respectively. The continuous decrease in N$'e$el temperature $$T_0$$($$T_N$$), despite an abrupt increase in $${mu}$$, underlines the strong anisotropy in the exchange interaction in CeRu$$_2$$Al$$_{10}$$, and the fact that this anisotropy is easily suppressed by electron doping.

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