Low-temperature study of field-induced antiferromagnetic-ferromagnetic transition in Pd-doped Fe-Rh
Low-temperature study of field-induced antiferromagnetic-ferromagnetic transition in Pd-doped Fe-Rh
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DOI：
10.1103/physrevb.80.174413
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发表时间：
2009-11-01
影响因子：
3.7
通讯作者：
Chaddah, P.
中科院分区：
文献类型：
--
作者：
Kushwaha, Pallavi;Lakhani, Archana;Chaddah, P.
研究了功能材料Fe(49)(Rh(0.93)Pd(0.07))(51)在低温和强磁场下的一级反铁磁(AFM)向铁磁(FM)转变。我们讨论了FM向AFM转变所需的低临界场中的非单调变化。结果表明，在50K以下，相变动力学以临界慢速为主。在低温强磁场下，系统的状态依赖于测量历史，导致AFM和FM可调谐共存。通过遵循不等磁场冷却和加热方案，证明了在6T磁场下的平衡态是原子力显微镜态。6T时的玻璃态(经8T冷却后得到)随温度升高呈现重入相变，即脱玻璃化到AFM态，然后熔化到FM态。
The first-order antiferromagnetic (AFM) to ferromagnetic (FM) transition in the functional material Fe(49)(Rh(0.93)Pd(0.07))(51) has been studied at low temperatures and high magnetic fields. We have addressed the nonmonotonic variation in lower critical field required for FM to AFM transition. It is shown that critically slow dynamics of the transition dominates below 50 K. At low temperature and high magnetic field, state of the system depends on the measurement history resulting in tunable coexistence of AFM and FM phases. By following cooling and heating in unequal magnetic field protocol it is shown that equilibrium state at 6 T magnetic field is AFM state. Glasslike FM state at 6 T (obtained after cooling in 8 T) shows reentrant transition with increasing temperature; viz., devitrification to AFM state followed by melting to FM state.