Autowiring fails in implementation class

I have a class implementing an interface as below:

@Service
public class BaseImpl implements Base{
  @Autowired
  Details details;
  ...
  public void doSomething(){
  }
}

Code for the interface:

@Service
public interface Base{
  void doSomething();
}

My configuration class:

@Configuration
public class AppConfig {
    @Bean(name="samplebean")
    public Base getImpl(){
        return new BaseImpl();
    }
}

Finally, I call the BaseImpl class as below:

@RestController
@RequestMapping(value = "...")
public class Caller{
  public void foo(){
    Base b = (Base) context.getBean("samplebean");
    b.doSomething();
  }
}

I get the following error:

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.model.Details com.pkg.BaseImpl.details; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.model.Details] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 35 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.model.Details] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1308)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1054)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:949)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 37 more

However, when I do the same auto-wiring in the Caller class, it seems to work fine. I'm new to Spring, so I might be missing something here.

Thanks.