Study of exchange-coupled bias field in Ni-Fe/Pd-Pt-Mn thin films

Paramagnetic to antiferromagnetic phase transformation in sputter deposited Pt–Mn thin films

“…8 Some of these requirements include a high pinning field at the operating temperature of the device ͑approximately 120°C), 9 a high blocking temperature ͑i.e., the temperature at which the pinning field drops to zero͒, good corrosion resistance, and low cost. One class of AFM materials that can meet these requirements are the L1 0 ordered tetragonal alloys, 8,[10][11][12][13][14] such as NiMn and PdMn. Another material from this class, PtMn, has emerged as a promising candidate for exchange biasing.…”

Influence of nano-oxide layer on the giant magnetoresistance and exchange bias of NiMn/Co/Cu/Co spin valve sensors

“…In recent years, several antiferromagnetic ͑AFM͒ materials have been used as pinning layers. [3][4][5] Among these, NiMn in the L1 0 ordered phase is a promising AFM material due to its large H ex , high blocking temperature, excellent thermal stability, and good corrosion resistance. 6 In NiMn films the disordered fcc phase is found which exhibits paramagnetic behavior.…”

Thickness dependence of exchange anisotropy for (0 0 1) oriented Mn89Pt11/NiFe and Mn80Ir20/NiFe bilayers

“…r Exchange biasing at ferromagnet (F)/antiferromagnet (AF) interface plays an important role in spin valve magnetic heads and MRAMs. Despite its technological importance, the mechanism of the exchange biasing is still unclear, even though both experimental and theoretical researches have been carried out extensively [1][2][3][4][5]. We have studied the exchange anisotropies of (0 0 1) oriented Mn 100Àx Pt x /NiFe epitaxial bilayers around x ¼ 10 at%, since Mn 90 Pt 10 /NiFe is known to exhibit a large exchange biasing field without heat treatment [6], and epitaxial bilayers are useful to insight the relationship between the exchange anisotropy and the crystalline anisotropy of the AF layer.…”