Hysteretic behavior of angular dependence of exchange bias in FeNi/FeMn bilayers.
نویسندگان
چکیده
For FeNi/FeMn bilayers, the angular dependence of exchange bias shows hysteresis between clockwise and counterclockwise rotations, as a new signature. The hysteresis decreases for thick antiferromagnet layers. Calculations have clearly shown that the orientation of antiferromagnet spins also exhibits hysteresis between clockwise and counterclockwise rotations. This furnishes an interpretation of the macroscopic behavior of the ferromagnetic layer in terms of the thermally driven evolution of the magnetic state of the antiferromagnet layer.
منابع مشابه
Exchange biasing in as-prepared Co/FeMn bilayers and magnetic properties of ultrathin single layer films
For Co and CoNi single layer films, the coercivity is a linear function of the inverse layer thickness and has an angular dependence of a fourfold-like symmetry although only a uniaxial anisotropy exists. For both as-prepared and post field-cooled Co/FeMn bilayers, the exchange field and the coercivity enhancement are proportional to the inverse Co thickness. For as-prepared ones, the exchange ...
متن کاملSpin Structure at the Interface of Exchange Biased FeMn/Co Bilayers
The origin of exchange biasing in FeMn/Co bilayers is elucidated using magneto optic Kerr e ect and x-ray dichroism. It is found that interaction and interdi usion between the Co and FeMn layers strongly in uence the interface magnetic structure. For example, although the bulk spin structure of antiferromagnetic (AF) FeMn is noncollinear, about 4 ML of FeMn near the Co interface appear to take ...
متن کاملRotation of the pinning direction in the exchange bias training effect in polycrystalline NiFe/FeMn bilayers.
For polycrystalline NiFe/FeMn bilayers, we have observed and quantified the rotation of the pinning direction in the exchange bias training and recovery effects. During consecutive hysteresis loops, the rotation of the pinning direction strongly depends on the magnetization reversal mechanism of the ferromagnet layer. The interfacial uncompensated magnetic moment of antiferromagnetic grains may...
متن کاملControl of exchange bias by diluting the antiferromagnetic layer
The domain state model for exchange bias is used for an investigation of recent experiments where the magnitude and direction of the exchange bias was controlled by He ion irradiation of an FeNi/FeMn sample. The defects in the sample which result from the irradiation are modeled as diluting the antiferromagnet ~AFM! after the initial cooling procedure. This late dilution, carried out in presenc...
متن کاملAsymmetric recovery effect of exchange bias in polycrystalline NiFe/FeMn bilayers
NiFe/FeMn bilayers X. P. Qiu, Z. Shi, S. M. Zhou, J. Du, X. J. Bai, R. Chantrell, and L. Sun Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China Department of Physics, The University of York, York, YO10 5 DD, United Kingdom Department...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 99 5 شماره
صفحات -
تاریخ انتشار 2007